Optics confidential

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41 posts · 75,688 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.

Pablo Artal
41 posts

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  • February 26, 2009
  • 12:00 AM

Eyes are not centered optical systems...

by Pablo Artal in Optics confidential

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.

  • February 18, 2010
  • 07:00 AM

Chromatic aberration of the eye: to correct or not to correct?

by Pablo Artal in Optics confidential

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 »

  • January 7, 2009
  • 12:00 AM

A simple description of the eye: structure and optical function

by Pablo Artal in Optics confidential

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.

  • November 25, 2008
  • 12:00 AM

Neural adaptation to the eye optics

by Pablo Artal in Optics confidential

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...
... Read more »

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  

  • October 29, 2008
  • 12:00 AM

To be cited or not to be cited

by Pablo Artal in Optics confidential

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.

  • October 22, 2008
  • 12:00 AM

Lecture on the eye as a robust optical system

by Pablo Artal in Optics confidential

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.

  • December 30, 2009
  • 06:45 AM

2010, the year when 20/10 vision was promised

by Pablo Artal in Optics confidential

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:/

  • March 15, 2011
  • 12:00 PM

The optics of the eye in older people is not as bad as you would think...

by Pablo Artal in Optics confidential

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  

  • June 2, 2009
  • 04:58 PM

Plagiarism... what can be done? simply suffer it?

by Pablo Artal in Optics confidential

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.

  • February 1, 2009
  • 12:00 AM

Aspheric intraocular lenses: mimicking the young eye

by Pablo Artal in Optics confidential

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.

  • April 15, 2009
  • 07:35 AM

Light adjustable intraocular lenses: the future is here

by Pablo Artal in Optics confidential

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.

  • October 6, 2008
  • 12:00 AM

Optics of the human eye in subjects with natural supervision

by Pablo Artal in Optics confidential

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.

  • December 9, 2008
  • 12:00 AM

Myopia research: some news

by Pablo Artal in Optics confidential

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 »

  • February 20, 2012
  • 02:09 AM

Which intraocular lens fits my eye? Science not magic

by Pablo Artal in Optics confidential

Learn how to determine the power of an intraocular lens after cataract surgery. Science, not magic...... Read more »

  • August 31, 2010
  • 01:51 PM

Seeing double: perhaps is simply optical diplopia

by Pablo Artal in Optics confidential

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 »

  • March 17, 2009
  • 05:00 AM

Exploring the eye with invisible light

by Pablo Artal in Optics confidential

On how invisible infrared light can be used as a tool to study the optics of the human eye...... Read more »

  • March 31, 2009
  • 05:00 AM

Scatter and spherical aberration: a good marriage in the eye?

by Pablo Artal in Optics confidential

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 »

  • October 2, 2008
  • 12:00 AM

The eye's aplanatic answer

by Pablo Artal in Optics confidential

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.

  • September 29, 2009
  • 06:02 AM

How we see? How they see? Simulation of vision in myopia, catract, supervision...

by Pablo Artal in Optics confidential

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:/

  • February 7, 2011
  • 01:30 PM

How can I know if I have cataracts and its severity?

by Pablo Artal in Optics confidential

Lear about a new optical method to detect and grade cataract... and more... Read more »

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