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Why are multifocal lenses for cataract surgery not suggested to some people?

Multifocal IOLs (Intraocular Lens Implants) are the most popular and successful of the various IOL designs meant to provide good uncorrected distance and near vision after cataract surgery. So why wouldn't every ophthalmologist suggest them to their patients? There are...

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How can you have double vision in a single eye?

Strange as it may sound, it is indeed possible to have "double vision" in just one eye. This is usually due to a developing cataract. The natural human lens is not solid like the lens in a pair of glasses. Rather, it is more like an onion...

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What are reasons some doctors remove cataract when it is not fully mature vs some who make patients wait for vision to go lower and cataract to mature? What is the basis for when cataract should be removed?

Cataract surgery should be considered when you (as the patient) decide you need to see better and glasses/contact lenses are no longer doing the job. The word "cataract" is itself misleading. What we are talking about is the natural human (or "crystalline") lens that...

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Is it normal that I can see better close up without my contact lenses in that I use for distance vision? My close-up eyesight is fine without lenses but it goes blurred when I put my lenses in.

I would guess that you are nearsighted and over about age 45. Myopia (nearsightedness) is where your eyes' default focus is up close instead of off at a distance as is the case in the normal eye. The one good thing about being nearsighted and reaching middle-age is...

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What subtle detail is added in advertising to increase the attractiveness of a poster?

Marketing companies can use the power of the unconscious and the subtleties of our brain to manipulate us and encourage us to buy their product. Here is a little test to demonstrate: Instinctively, if you had to designate your favorite photo as quickly as possible,...

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Something that always baffled me was how the brain can turn the two slightly different images received from both eyes into one single image. How does the brain deal with this?

We tend to think of our eyes as two video cameras, sending two overlapping images to the brain where vision is passively perceived. But human vision is different from video cameras in many important ways -and it is not a passive process. The image each eye sees is...

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Does the vision quality of the two eyes need to be the same? What if it's not?

You do not necessarily need to have the same visual acuity or refractive error (glasses Rx) in both of your eyes, although that is usually the case. A common strategy to deal with presbyopia is something called "monovision."...

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What can LASIK not fix?

Lots of things related to vision cannot be fixed with LASIK. Disease and degenerations like macular degeneration and cataracts are not at all suited for LASIK treatment. In the world of vision problems that glasses can correct (which is really what refractive surgery...

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