41 posts · 74,210 views
Optics Confidential is a blog with questions and answers on optical research, with emphasis in Visual, Ophthalmic and Biomedical Optics. The social impact of science and career development of young scientists is also covered.
The different optical components of the eye, the cornea and the crystalline lens are not properly aligned with the area of the retina (the fovea) providing the highest spatial resolution. Some information on this issue and a description of a new instrument to measure eye misalgnment is presented...... Read more »
J. Tabernero, A. Benito, V. Nourrit, and P. Artal. (2006) Instrument for measuring the misalignments of ocular surfaces. Optics Express, 10945-10956.
The human eye suffers of a very large chromatic aberration. This means that when a red object is in focus, a blue one at the same distance will be clearly out of focus. Why we are not yet routinely correcting this defect to improve vision? You will find here some new experiments, results and explanations...... Read more »
Artal, P., Manzanera, S., Piers, P., & Weeber, H. (2010) Visual effect of the combined correction of spherical and longitudinal chromatic aberrations. Optics Express, 18(2), 1637. DOI: 10.1364/OE.18.001637
An easy description of the human eye: structure and optical functioning... Read more »
P. Artal, A. Benito, J. Tabernero. (2006) The human eye is an example of robust optical design. Journal of Vision, 1-7.
The visual system could be adapted to the particular optical properties of each person's eyes. An experiment using an adaptive optics visual simulator was used to demonstrate this hypothesis. Some details of the experiment and the impact of the finding are discussed...
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Pablo Artal, Li Chen, Enrique J. Fernández, Ben Singer,Silvestre Manzanera,David R. Williams. (2004) Neural compensation for the eye's optical aberrations. Journal of Vision, 4(4), 281-287. DOI: 10.1167/4.4.4
A lecture describing in detail the optical properties of the eye given at the international Visual Optics School in Crete last summer. Useful to better understand the article in "Nature Photonics" ... Read more »
Artal P. . (2008) The eye's aplanatic answer. Nature Photon., 2(10), 586.
Citations etiquette is a very important part of scientific research. Some comments on the topic and a practical example of one of my early papers where I first describe how to simulate retinal images of any object in real eyes for different conditions. The approach was widely used later but the paper poorly cited...... Read more »
P. Artal. (1990) Calculations of two-dimensional foveal retinal images in real eyes. J.Opt.Soc.Am.A., 1374-1381.
The promise of perfect "20/10" vision for everybody appeared to be a real possibility in the early 2000's. 2010 is already here and your doctor cannot offer you yet supervision...... Read more »
Santamaria, Artal, Bescos. (1987) Determination of the point spread function of human eyes using a hybrid optical-digital method. J.Opt.Soc.Am.A., 1109. info:/
Aspheric intraocular lenses provide cataract patients with better quality of vision. The history of how these lenses were developed trying to copy the optical properties of young eyes is described ... Read more »
P. Artal, E. Berrio, A. Guirao, P. Piers. (2002) Contribution of the cornea and internal surfaces to the change of ocular aberrations with age. J.Opt.Soc.Am.A., 137.
Some comments on the impact of plagiarism on science. How affect scientists; what can we do as scientists and more... (ah! and some recommendations on restaurants too).... Read more »
P.Artal, S. Marcos, R. Navarro, D. R. Williams. (1995) Odd aberrations and double-pass measurements of retinal image quality. J. Opt. Soc. Am. A, 195.
A new type of light adjustable intraocular lenses promises patients to be spectacles-free after cataract surgery. See a description of these new lenses and how the optical results after sugery were controlled using a Hartmann-Shack wavefront sensor based refraction approach...... Read more »
P. M. Prieto, F. Vargas-Martín, S. Goelz, P. Artal. (2000) Analysis of the performance of the Hartmann-Shack sensor in the human eye. J. Opt. Soc. Am. A, 1388.
The eye is an optical instrument made of biological tissues and surprinsingly still working after many years... you may know some reasons.... Read more »
Berrio, E., Tabernero, J., & Artal, P. (2010) Optical aberrations and alignment of the eye with age. Journal of Vision, 10(14), 34-34. DOI: 10.1167/10.14.34
The optics of the human eye impose the first limit to vision. We studied the eye's optics in a group of subjects having natural supervision, that is to say, excellent visual acuity. We discovered that having a superior visual acuity does not require an excellent optical quality of the eye...... Read more »
E. A. Villegas, E. Alcon, and P. Artal. (2008) Optical Quality of the Eye in Subjects with Normal and Excellent Visual Acuity. Invest. Ophthalmol. Vis. Sci., 49(10), 4688-4696.
Some of the new advances in myopia research presented in a recent meeting is revised. In particular, I cover the differences in the optical properties of the myopic eye in the peripheral retina and the future potential optical approaches to control myopia development based in these findings.... Read more »
Seidemann et al. (2002) Peripheral refractive errors in myopic, emmetropic, and hyperopic young subjects. J. Opt. Soc. Am. A, 2363.
Learn how to determine the power of an intraocular lens after cataract surgery. Science, not magic...... Read more »
Canovas, C., & Artal, P. (2011) Customized eye models for determining optimized intraocular lenses power. Biomedical Optics Express, 2(6), 1649. DOI: 10.1364/BOE.2.001649
Changes in the optics of the eye can produce double or even multiple images... a real case is explained as an example and more... ... Read more »
Pérez, G., Abenza, S., De Casas, A., Marín, J., & Artal, P. (2010) Cause of Monocular Diplopia Diagnosed by Combining Double-pass Retinal Image Assessment and Hartmann-Shack Aberrometry. Journal of Refractive Surgery, 26(4), 301-304. DOI: 10.3928/1081597X-20100218-05
On how invisible infrared light can be used as a tool to study the optics of the human eye...... Read more »
Fernández, E., & Artal, P. (2008) Ocular aberrations up to the infrared range: from 6328 to 1070 nm. Optics Express, 16(26), 21199. DOI: 10.1364/OE.16.021199
A (relatively) simple description of a new recent finding in the optics of the human eye: the compensatory effect of spherical aberration and scatter...... Read more »
Guillermo M. Pérez,Silvestre Manzanera . (2009) Impact of scattering and spherical aberration in contrast sensitivity. Journal of Vision, 9(3), 1-10. DOI: http://www.journalofvision.org/9/3/19/
Commentary article summarizing some of our recent advances in the understating of the optical properties of the human eye.... Read more »
Artal, P. . (2008) The eye’s aplanatic answer. Nature Photon., 586-589.
Short lecture of Pablo Artal, professor of Optics at the University of Murcia in Spain on how different persons see the world. Based in the use of a unique research tool: the adaptive optics visual simulator. Learn how a myopic person sees, or a person with cataract or how a lucky individual with "supervision" can read letters at great distance!... Read more »
E. J. Fernández, S. Manzanera, P. Piers, P. Artal. (2002) Adaptive optics visual simulator. J. Refract. Surg. info:/
Adaptive optics is a technology to obtaing better images. Initially applied in large telescopes, moved to the eye and now is expanding to a large range of interesting applications...... Read more »
E. J. Fernández, I. Iglesias, P.Artal,. (2001) Closed-loop adaptive optics in the human eye . Opt. Lett., 746-748.
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