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REVIEW 2 major objections 5 minor 11 references

Roadmap on Advances in Visual and Physiological Optics

T0 review · 2 major / 5 minor · reviewed 2026-08-12 · deepseek-v4-flash

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Pith's one-line read A field-wide roadmap claims that the next leap in vision science lies in direct biomechanical and cellular measurement, anchored by the first evidence that mechanical maps can match or beat shape-based tests for early keratoconus.

desk verdict A genuinely useful expert roadmap with no new science, but Section 4's 'first evidence' claim overreaches what two self-cited, unreplicated studies can support. read the letter →

arxiv 2411.14606 v1 pith:4MFNWKMU submitted 2024-11-21 physics.optics

Jesús E. Gómez-Correa , Brian Vohnsen , Barbara K. Pierścionek , Sabino Chávez-Cerda , Sabine Kling , Jos J. Rozema , Raymond A. Applegate , Giuliano Scarcelli
show 20 more authors
J. Bradley Randleman Alexander V. Goncharov Amy Fitzpatrick Jessica I. W. Morgan Austin Roorda David A. Atchison Juan P. Trevino Alejandra Consejo Charlie Börjeson Linda Lundström Seung Pil Bang Geunyoung Yoon Karol Karnowski Bartlomiej J. Kaluzny Ireneusz Grulkowski Sergio Barbero Pablo Artal Juan Tabernero Pete Kollbaum Stéphanie C. Thébault
This is my paper · ORCID
classification physics.optics
keywords visualopticsphysiologicalcornealbiomechanicskeratoconusBrillouinmicroscopyadaptiveretinalimagingeyemodels
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This multi-expert roadmap seeks to establish where visual and physiological optics stands in the late 2020s and which directions deserve investment: direct measurement of corneal biomechanics, cellular-resolution imaging of the living retina, and computational eye models that are personalized rather than population averages. Its most concrete and falsifiable claim appears in the corneal elastography section: motion-tracking Brillouin microscopy, which corrects eye-movement artifacts with co-located OCT, provides the first experimental evidence that focal weakening in keratoconus corneas can be quantified with metrics that reach or surpass clinical morphological metrics such as maximum curvature and thinnest pachymetry. If that holds, keratoconus could be detected and treated earlier, before shape changes and vision loss become irreversible. The rest of the roadmap argues that similar convergence of optical technology, biomechanics, and neuroscience is transforming lens modelling, retinal imaging, peripheral optics, intraocular-pressure monitoring, and the design of contact and intraocular lenses.

What carries the argument

The machine that carries the strongest specific claim is motion-tracking Brillouin microscopy: a technique that measures the longitudinal modulus of corneal tissue from the wavelength shift of light scattered by thermal acoustic phonons, and that pairs the Brillouin measurement with co-located optical coherence tomography so that eye motion during acquisition can be corrected. This combination turns a previously motion-sensitive laboratory method into a clinically usable stiffness mapping tool, and it is what allows the paper to report focal weakening in keratoconus rather than only a global average. The broader argument is carried by the roadmap format itself, with eighteen expert sections each following a status, challenges, advances, and outlook structure, together with a set of cross-cutting technical instruments: air-puff tonometry and optical coherence elastography for biomechanics, adaptive optics ophthalmoscopy and optoretinography for cellular function, GRIN (gradient-index) lens models such as the Poisson-Gauss and AVOCADO models, and generative statistical eye models that synthesize realistic biometric variation.

What would settle it

A masked, independent study comparing motion-tracking Brillouin maps with Scheimpflug tomography in a prospective cohort of subclinical keratoconus suspects would settle the specific claim: if regional Brillouin-shift metrics fail to identify the eyes that later progress, or if Kmax and thinnest pachymetry separate them as well or better, then the first-experimental-evidence conclusion collapses. For the roadmap as a whole, a documented expert disagreement about the importance of an omitted topic, or a correction to one of the section claims that changes its recommendations, would weaken the resource value.

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Extended reading notes

Core claim

The paper's central claim is that visual and physiological optics has reached a point where the eye's biological structure, its optical function, and its neural processing can be studied as one coupled system, and that this integration is reshaping both science and clinical care. Section 4 states the sharpest result: after decades of relying on corneal shape as a surrogate for mechanical health, motion-tracking Brillouin microscopy now yields regional maps of corneal stiffness in vivo, and in early and subclinical keratoconus these mechanical metrics perform as well as or better than maximum curvature (Kmax) and thinnest pachymetry, with some spatially resolved metrics reaching AUROC=1 and with subclinical eyes invisible to Scheimpflug tomography showing statistically significant focal weakening. The roadmap presents this as the first experimental evidence demonstrating metrics quantifying focal weakening in keratoconus corneas that can reach or surpass clinical and morphological metrics. Around this milestone, the survey argues that adaptive optics has turned the ophthalmoscope into a microscope for nearly every retinal cell class; that wavefront-guided scleral lenses can return highly aberrated keratoconic eyes to age-normal image quality when assessed by visual Strehl ratio rather than RMS wavefront error; and that the next generation of eye models must combine optics, biomechanics, and growth into patient-specific virtual twins.

Load-bearing premise

The roadmap's usefulness rests on the assumption that the invited expert sections accurately represent the current consensus and that the eighteen selected topics are the field's most important ones, and the Section 4 claim additionally rests on the assumption that its two cited motion-tracking Brillouin studies, which include the section's own contributors, are valid and not contradicted by independent work.

Editorial extensions

If this is right

  • Keratoconus screening could begin with mechanical maps rather than shape: focal weakening may be visible before steepening or thinning, enabling earlier cross-linking and better-preserved vision.
  • Wavefront-guided scleral lenses, judged by visual Strehl ratio instead of RMS wavefront error, could bring keratoconic eyes back to age-normal image quality, provided manufacturers meet the tight rotation and translation tolerances the paper specifies.
  • Adaptive optics combined with optoretinography could provide cellular-resolution functional readouts of photoreceptor health, giving gene and stem cell therapies a faster, objective endpoint.
  • IOL power and refractive surgery planning could become robust to unusual eye lengths and shapes if customizable and generative eye models replace one-size-fits-all average eyes.
  • Continuous intraocular-pressure monitoring through smart contact lenses and implants would capture the diurnal fluctuations that single clinic measurements miss, changing glaucoma management.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The Brillouin milestone, if independently replicated in larger and more diverse cohorts, would likely shift the clinical definition of early keratoconus from tomographic morphology to mechanical vulnerability, and with it the insurance and treatment thresholds for cross-linking.
  • The roadmap's recurring demand that optics, biomechanics, and neural processing be modelled together suggests a testable near-term goal: an opto-mechanical virtual twin that predicts both refractive outcome and ectasia risk for a given surgical plan in a specific patient.
  • If peripheral image quality is indeed a driver of myopia progression, then myopia-control spectacle and contact lens designs should be benchmarked by their peripheral optical effect measured with double-pass or scanning instruments, not only by central acuity and central refraction.
  • Several sections assume that population-averaged eye models are good enough for device design; an unstated corollary is that as biometry data from large clinical databases become available, generative models trained on those data could outperform parametric models and become the default testbed for new lens designs.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

2 major / 5 minor

Summary. This manuscript is a multi-author Roadmap on advances in visual and physiological optics, comprising 19 thematic sections that span corneal biomechanics, keratoconus, corneal imaging and elastography, crystalline lens structure and modelling, ray tracing, photoreceptors, retinal imaging, adaptive optics, schematic eye models, ocular surface modelling, peripheral image quality, optical aberrations, intraocular pressure, lens designs, and neuro-vision interfaces. Each section follows a common structure of status, current and future challenges, advances in science and technology, and concluding remarks. The document is explicitly intended as a comprehensive reference and forward-looking resource for ophthalmologists, optometrists, vision scientists, and engineers. There is no new experimental data, derivation, or code; the paper's contribution is aggregative and interpretive.

Significance. If the expert summaries are reliable, the Roadmap is a genuinely useful survey: it collects current clinical and research topics in one place, cites recent literature, and identifies concrete technical bottlenecks such as the inverse GRIN-lens reconstruction problem, the lack of standardized corneal biomechanical metrics, and the need for validated automated retinal biomarkers. Its uniform status/challenges/advances structure makes it accessible to non-specialists, and several sections give credit to specific falsifiable or quantifiable developments, including motion-tracking Brillouin microscopy, optoretinography, and generative eye models. The significance is, however, contingent on the factual reliability of the individual sections, and the manuscript contains at least one strong superlative claim that is not supported by the evidence reported in the text. Because the document presents itself as an authoritative roadmap rather than a collection of personal opinions, that unsupported claim and an internal prevalence inconsistency need to be corrected before the survey can be recommended as a reference resource.

major comments (2)
  1. [Sec. 4 ('Advancements in corneal imaging and elastography')] The text states that motion-tracking Brillouin microscopy produced ROC curves 'reaching AUROC=1' and that 'this is the first experimental evidence demonstrating metrics quantifying focal weakening in keratoconus corneas that can reach or surpass clinical/morphological metrics.' The only support provided is Refs [20,21], both from the section's own group, and the text does not report the number of eyes examined, confidence intervals, the definition of the 'subclinical' versus 'early' keratoconus groups, or whether the AUROC values were obtained on a held-out data set. A perfect area under the ROC curve in a small, single-center, non-replicated study is a strong warning of possible overfitting or selection bias. As written, a review document presents a non-replicated research finding as an established milestone. This claim should either be substantially documented with these details or explicitly labeled as a preliminary, single-center result awaiting independent replication.
  2. [Sec. 4 vs. Sec. 3] The manuscript gives contradictory keratoconus prevalence figures. Section 4 states that keratoconus prevalence is '2-5%' and 'significantly higher than thought,' while Section 3 cites an 'estimated prevalence of about 1:375,' which is approximately 0.27%. If both numbers are correct, the difference in definitions or populations must be explained; otherwise the Roadmap offers readers irreconcilable prevalence estimates and undermines its claim to be a reliable source. The authors should reconcile the two statements or qualify them with the relevant study populations and diagnostic criteria.
minor comments (5)
  1. [Sec. 12, Eq. (1)] The inline expansion of the surface function z(x,y) is garbled in the manuscript; the summation indices, basis functions, and error term should be typeset correctly.
  2. [Sec. 13, Fig. 2 caption] The caption reads 'Defocus Incorporated Multiple Segmets'; 'Segmets' should be corrected to 'Segments'.
  3. [Sec. 14, Current and Future Challenges] The sentence 'Another challenge lies in wavefront reconstruction methods' is duplicated verbatim; one occurrence should be deleted.
  4. [Sec. 7, Ref. [10]] The reference contains misspelled author names: 'Lakshimarayanan' should be 'Lakshminarayanan' and 'Ghatsk' should be 'Ghatak'.
  5. [Sec. 9, Status] The phrase 'can been applied to retinal imaging' should be corrected to 'can be applied to retinal imaging'.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: the roadmap makes no fitted predictions or first-principles derivations; its specific claims are attributed to external experimental studies, including self-cited work that functions as normal evidence in a review.

full rationale

This manuscript is a roadmap-style review consisting of expert-authored status reports, challenges, and future directions. It contains no derivation chain: no parameter is fitted to data and then renamed as a prediction, no quantity is defined in terms of the quantity it is claimed to explain, and no uniqueness theorem or ansatz is imported to force a conclusion. The most specific empirical assertion, in Section 4, is that motion-tracking Brillouin microscopy provides 'the first experimental evidence demonstrating metrics quantifying focal weakening in keratoconus corneas that can reach or surpass clinical/morphological metrics.' That statement is explicitly an attribution to two prior peer-reviewed studies (Refs [20,21]) authored by the section's contributors. Citing one's own prior experimental results in a review is self-citation, but it is not circularity: the roadmap does not re-derive those results from its own assumptions, and the cited studies are externally falsifiable clinical measurements rather than constructs of the roadmap. Similar self-citations appear in the lens-model and photoreceptor sections, but always as reports of prior published work or as hypotheses, never as a load-bearing tautology. Under the hard rules, self-citation only counts as circular when the argument reduces to the citation itself; here the survey's role is to summarize, not to prove, and the reader can consult the cited primary literature. The absence of a derivation chain makes a circularity finding inappropriate. Concerns about whether the cited Brillouin results are replicated or generalizable are evidence-quality issues, not circularity, and do not raise the score under the enumerated patterns.

Assumptions & free parameters 0 free parameters · 3 assumptions · 0 invented entities

As a review, the roadmap introduces no free parameters or invented entities. It rests on the accuracy of the cited literature, the representativeness of the selected topics, and a few domain-specific background assumptions such as the biomechanical causation of corneal shape.

assumptions (3)
  • domain assumption The cited primary literature is accurately characterized and remains the state of the art in each subfield.
    Each of the 18 sections builds its Status and Challenges on specific references; the paper provides no independent verification of these references, so the roadmap's correctness depends on their accuracy.
  • domain assumption The 18 selected topics and their expert authors are representative of visual and physiological optics.
    The abstract asserts comprehensiveness without describing a selection methodology; a reader cannot distinguish deliberate scope choices from omissions.
  • domain assumption Corneal shape and visual acuity are driven by biomechanics (Section 4, Status).
    Section 4 states this is now widely recognized from first principles, computational studies, and experimental measurements, citing Refs [1-3], but presents no derivation or meta-analysis in the paper; it is an input to the section's argument that mechanical metrics are superior to morphological ones.

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Cite this review

Pith. "Pith review of Roadmap on Advances in Visual and Physiological Optics." pith.science (2026). https://pith.science/paper/4MFNWKMU

@misc{pith2026241114606,
  author       = {Pith},
  title        = {Pith review of: Roadmap on Advances in Visual and Physiological Optics},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/4MFNWKMU}},
  note         = {Machine review of arXiv:2411.14606}
}
read the original abstract

The field of visual and physiological optics is undergoing continuous significant advancements, driven by a deeper understanding of the human visual system and the development of cutting-edge optical technologies. This Roadmap, authored by leading experts, delves into critical areas such as corneal biomechanical properties, keratoconus, and advancements in corneal imaging and elastography. It explores the intricate structure-function relationship within the eye lens, offering new perspectives through lens models and ray tracing techniques. The document also covers advancements in retinal imaging, highlighting the current state and future directions, and the role of adaptive optics in evaluating retinal structure and function in both healthy and diseased eyes. Furthermore, it addresses the modelling of ocular surfaces using different mathematical functions and examines the factors affecting peripheral image quality in the human eye, emphasizing the importance of these aspects in visual performance. Additional topics include schematic and functional models of the human eye, the impact of optical and chromatic aberrations, and the design of contact, and intraocular lenses. Finally, the Roadmap addresses the intersection of neurosciences with vision health, presenting a comprehensive overview of current research and future trends aimed at improving visual health and optical performance. Ultimately, this Roadmap aims to serve as a valuable resource for ophthalmologists, optometrists, vision scientists, and engineers dedicated to advancing the field of visual and physiological optics.

Figures

Figures reproduced from arXiv: 2411.14606 by the authors.

Figure 1
Figure 1. Key areas of corneal biomechanics and their interactions [PITH_FULL_IMAGE:figures/full_fig_p006_1.png] view at source ↗
Figure 1
Figure 1. – We allow at most two figures that are roughly the size of this box [PITH_FULL_IMAGE:figures/full_fig_p014_1.png] view at source ↗
Figure 2
Figure 2. Motion tracking Brillouin imaging showing regional differences between a normal cornea (Control) and an eye with subclinical keratoconus. MT Brillouin shift values are uniform across the normal control eye, while there is clear focal weakening in evident in the subclinical KC eye [PITH_FULL_IMAGE:figures/full_fig_p015_2.png] view at source ↗
Figures from the paper (13 more)
Figure 1
Figure 1. Figure 1: ) [14-17,19,20]. If a single function is used, it represents both parts [8,9,11-13,18]. For the [PITH_FULL_IMAGE:figures/full_fig_p022_1.png]
Figure 2
Figure 2. Figure 2: Representation of the accommodation process in the human eye. The relaxed state (top) shows the ciliary muscle at rest, causing the lens to flatten for distant vision. In the accommodated state (bottom), the ciliary muscle contracts, allowing the lens to thicken and in…
Figure 1
Figure 1. Figure 1: The curved ray paths in a quadratic GRIN lens, for which the refractive index at the lens surface is n0=1.37 and at the centre nmax =1.57, the large value n max is chose to emphasise the ray bending effect in the lens [PITH_FULL_IMAGE:figures/full_fig_p027_1.png]
Figure 1
Figure 1. Figure 1: Macroscopic model of the foveal photoreceptor mosaic (a) with test tubes and food dyes to emulate the S, M and L cones of the human retina. The model is being used to (b) test the hypothesis of the Stiles-Crawford effects being mostly due to leakage of light [PITH_FUL…
Figure 2
Figure 2. Figure 2: Electromagnetic calculations of light leakage from 3 adjacent peripheral cones using (a) ray optics and (b) wave optics, respectively. Only the ideal case of on-axis incidence is shown, but the model is equally capable of analysing oblique light incidence [PITH_FULL_I…
Figure 1
Figure 1. Figure 1: Generic schematic of an AO system for the eye with a list of all the known imaging and vision testing modalities that will benefit. Current and Future Challenges So how do we benefit from a microscope for the human eye? Initial discoveries enabled by AO were primarily …
Figure 2
Figure 2. Figure 2: Selected images from AO systems. (A) AOSLO image of rods and cones using annular illumination. Adapted from [21]. (B) AOSLO phase contrast (split detector) image of the cone mosaic. Adapted from [22]. (C) AOSLO fluorescence imaging of the RPE mosaic using indocyanine g…
Figure 1
Figure 1. Figure 1: The four-surface model of the human eye. The diagram corresponds to spherical surfaces with typical curvature radii [PITH_FULL_IMAGE:figures/full_fig_p049_1.png]
Figure 1
Figure 1. Figure 1: – We allow at most two figures that are roughly the size of this box [PITH_FULL_IMAGE:figures/full_fig_p055_1.png]
Figure 1
Figure 1. Figure 1: Recent and Emerging IOP Measurement and Monitoring Methods. On the right, a cross-sectional view of the human eye displays the aqueous humor circulation pathways indicated by red arrows. Intraocular pressure (IOP) affects all structures of the eye. A) Mechanical stimul…
Figure 1
Figure 1. Figure 1: Scheme showing how the simultaneous vision principle worksillustrated with a contact lens. Rays from a far object (green arrow emerging from the sun) passing through one region of the contact lens converge onto the retina. Conversely, rays from a near object (red arrow…
Figure 1
Figure 1. Figure 1: Anterior OCT image of a patient implanted with an inverted meniscus IOL [PITH_FULL_IMAGE:figures/full_fig_p074_1.png]
Figure 1
Figure 1. Figure 1: Imaging of the retinal head and optic nerve and electrophysiological data are the basis for the diagnosis (Dx) of the main retinopathies, including diabetic retinopathy (DR), age-related macular degeneration (AMD) and retinitis pigmentosa (RP), but are also currently b…

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Reference graph

Works this paper leans on

11 extracted references · 11 canonical work pages

  1. [6]

    presbyopia, causes blurred images when viewing objects at different distance locations

    Varying optical power design of progressive spectacles, contact, and intraocular lenses Sergio Barbero Instituto de Óptica (CSIC), Serrano 121, Madrid, Spain [ sergio.barbero@csic.es ] Status The degradation of the accommodation capabilities of the crystalline lens with age, i.e. presbyopia, causes blurred images when viewing objects at different distance...

    work page 2020

  2. [7]

    J., Kowalczyk, A., and Wojtkowski, M

    Alonso-Caneiro, D., Karnowski, K., Kaluzny, B. J., Kowalczyk, A., and Wojtkowski, M. (2011). Assessment of corneal dynamics with high-speed swept source optical coherence tomography combined with an air puff system. Opt. Express, 19(15), 14188-14199. [8] Curatolo, A., et al. (2020). Multi-meridian corneal imaging of air-puff induced deformation for improv...

    work page 2011

  3. [11]

    H., et al

    Marshel, J. H., et al. (2019). Cortical layer-specific critical dynamics triggering perception. Science, 365(6453). [13] Botto, C., Dalkara, D., and El-Amraoui, A. (2021). Progress in gene editing tools and their potential for correcting mutations underlying hearing and vision loss. Front. Genome Edit., 3. [14] Hall, J. C., Paull, D., Pébay, A., and Lidge...

    work page 2019

  4. [12]

    W., Hwang, H

    Lee, S., Park, G., Kim, S., Ryu, Y., Yoon, J. W., Hwang, H. S., Song, I. S., Lee, C. S., and Song, S. H. (2022). Geometric-phase intraocular lenses with multifocality. Light Sci. Appl., 11:320. [13] Shaker, L. M., Al-Amiery, A., Isahak, W. N. R. W., and Al-Azzawi, W. K. (2023). Metasurface contact lenses: a futuristic leap in vision enhancement. J. Optics...

    work page 2022

  5. [13]

    Romashchenko, D., and Lundström, L. (2020). Dual-angle open field wavefront sensor for simultaneous measurements of the central and peripheral human eye. Biomed. Opt. Express, 11(6), 3125–3138. [14] Pusti, D., Kendrick, C. D., Wu, Y., Ji, Q., Jung, H. W., and Yoon, G. (2023). Widefield wavefront sensor for multidirectional peripheral retinal scanning. Bio...

    work page 2020

  6. [14]

    Optical aberrations of the human eye Seung Pil Bang, MD, PhD1, Geunyoung Yoon, PhD2 1Department of Ophthalmology, Keimyung University Dongsan Medical Center, Daegu, South Korea 2College of Optometry, University of Houston, Houston, TX, USA [gibong87@dsmc.or.kr ; gyoon2@central.uh.edu] Status Over the past several decades, the study of monochromatic aberra...

    work page 1961

  7. [15]

    Kaluzny3, Ireneusz Grulkowski4 1 International Centre for Translational Eye Research, ul

    Intraocular pressure of the human eye Karol Karnowski1,2, Bartlomiej J. Kaluzny3, Ireneusz Grulkowski4 1 International Centre for Translational Eye Research, ul. Skierniewicka 10A, 01-230 Warsaw, Poland 2 Institute of Physical Chemistry, Polish Academy of Sciences, ul. M. Kasprzaka 44/52, 01-224 Warszawa, Poland 3 Department of Ophthalmology, Collegium Me...

    work page 2022

  8. [16]

    S., Alam, H., and Yoon, G

    Ji, Q., Yoo, Y. S., Alam, H., and Yoon, G. (2018). Through-focus optical characteristics of monofocal and bifocal soft contact lenses across the peripheral visual field. Ophthalmic Physiol. Opt., 38(3), 326-336. [17] Bang, S. P., Jung, H., Li, K. Y., and Yoon, G. (2024). Comparison of modal and zonal wavefront measurements of refractive extended depth of ...

    work page 2018

Show all 11 references
  1. [17]

    Traditional intraocular lenses (IOLs), however, are primarily designed to optimize central or foveal vision, often neglecting the quality of vision in the peripheral retina

    Intraocular lenses and peripheral vision Pablo Artal and Juan Tabernero Laboratorio de Optica, Universidad de Murcia, 30100 Murcia, Spain [ juant@um.es ; pablo@um.es] Status In a natural phakic eye, the crystalline lens is a thick lens with a gradient refractive index that sup...

    1993

  2. [18]

    extended depth of focus

    Advances in contact lens optics Pete Kollbaum, OD, PhD Indiana University, 800 East Atwater Avenue, Bloomington, IN 47405, USA [ kollbaum@iu.edu ] Status Although the exact time is not precisely known, the earliest form of contact lenses were described by the early 1500’s. The...

    2002

  3. [19]

    lazy eye

    Neurosciences applied to vision health Stéphanie C. Thébault Laboratorio de Investigación Traslacional en Salud Visual (D-13), Instituto de Neurobiología, Universidad Nacional Autónoma de México (UNAM), Querétaro, Mexico [ sthebault@comunidad.unam.mx ] Status Visual science is...

    2003

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