Dear Pablo, I was always curious to know how other people see the world. A myopic person or a person with excellent vision, or my grandfather with cataracts? I wonder if you could show something like that. Erika, Bergen, Norway.
I received many questions similar to this from Erika quite often. In fact, I already promised several times to some readers of this blog to cover this aspect. And finally here you have my response and in a special way! (I hope it was good to wait...)
This is a very interesting question. We always want to know about others sensations, and moreover is nice to be, even for an instant, in the boots of others! (specially those with problems).
In addition, now we can simulate under quite realistic conditions how are the images in the retina for different cases. We used our unique research tool: the adaptive optics visual simulator to produce images of letters (or in fact any picture) as they were seen by myopes, presbyopes, cataract patients and... also by myself (with different types of corrections).
Carmen Canovas and Alejandro Mira, two of my PhD students at my laboratory helped me to produce these images (Thanks!).
In addition, now we can simulate under quite realistic conditions how are the images in the retina for different cases. We used our unique research tool: the adaptive optics visual simulator to produce images of letters (or in fact any picture) as they were seen by myopes, presbyopes, cataract patients and... also by myself (with different types of corrections).
Carmen Canovas and Alejandro Mira, two of my PhD students at my laboratory helped me to produce these images (Thanks!).
In this post, instead of asking you tio read the details, I invite you to watch a special VIDEO clip where, first I explain how our adaptive optics visual simulator works and then I show to you some examples of images in different persons.
Learn how a myopic person sees, or a person with cataract or how a lucky individual with supervision can see letters at a great distance!
You can also find a version in Spanish of this video at: http://www.um.es/atica/contenidos/streaming/FLASH/player2.php?formato=169&video=nocheinvestigadores09/pabloArtalES.mp4
or in:
http://www.youtube.com/watch?v=4GSUBduW-jg
Here you have the example for myself. This is how I see a car at about 60 meters! … without my spectacles (I am about 1.5 diopters myopic)
… with my best spectacles correction
… and with supervision, or if my ocular aberrations were also corrected
E. J. Fernández, S. Manzanera, P. Piers, P. Artal (2002). Adaptive optics visual simulator J. Refract. Surg., 18
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10 comentarios:
I passed a California driving test while one eye was almost useless, while waiting for a cataract operation, and was amazed I could pass the exam. Knowing there are people driving cars out there with such bad vision really made me a more careful driver.
I was fine driving at night under ordinary conditions, but if I came upon an accident or warning barrier, the extra bright lights made the road disappear behind glare that looked much like this:
http://t0.gstatic.com/images?q=tbn:swIYloK6AMgo5M:http://news.thomasnet.com/IMT/fireworks%2520materials.jpg
And those people with the bright blue headlights should be aware that to anyone with vision problems like I had then, they produce the most amazing wall of glare that their vehicle and the road and the guidelines painted on it all disappear completely; it's like facing arc welders in fog.
Yes, the intraocular lens replacement surgery helped a lot. I still don't have even fair contrast sensitivity at night in the operated eye, compared to the eye that didn't need surgery,
Sir, excellent demonstration. Thanks for your work.
Pablo, it is also possible to simulate other optical conditions, such as diplopia? Anne
I am sure this instrument could be used to simulate other optical conditions related with aberrations, but not with light diffusion, I guess. Pablo Could you comment on this? Fernando
what are the differences between optical aberration and scattering? Both degrades vision in a similar way? LO
These are important remarks: scattering and aberration affects in a different way the retinal image.
They can even have somehow compensatory effects (See a previous post on the effect of spherical aberration in the presence of scattering:
http://pabloartal.blogspot.com/2009/03/scatter-and-spherical-aberration-good.html).
Because I think this can be better explained with images, I promise to cover this in a future post.
Nice, but I am curious on what is the model of the car in the photos. It is a Mazda Miata? Angelo
Angelo, yes, you are right, but in Europe this model is called: Mazda MX-5 Roadster Coupe. Nice little car!
Dear Pablo, your research in the binocular adaptive optics simulator is covered in the main page of the Institute of Physics web page:
http://optics.org/cws/article/research/40693
Congratulations. Andrew
Hi prof,
do you know of any contact lenses that are made in spain? i am doing a research on types of contact lenses from spain. thank you. singapore
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