Not every question will receive a direct response from an ophthalmologist. However, we will follow up with suggested ways to find appropriate information related to your question. Medical disclaimer By submitting your question, you agree to be answered by email. Your email address will only be used to answer your question unless you are an Academy member or are subscribed to Academy newsletters.

Numerical apertureof lens

Not every question will receive a direct response from an ophthalmologist. However, we will follow up with suggested ways to find appropriate information related to your question. Medical disclaimer By submitting your question, you agree to be answered by email. Your email address will only be used to answer your question unless you are an Academy member or are subscribed to Academy newsletters.

Not every question will receive a direct response from an ophthalmologist. However, we will follow up with suggested ways to find appropriate information related to your question. Medical disclaimer

Numerical apertureof microscope

By submitting your question, you agree to be answered by email. Your email address will only be used to answer your question unless you are an Academy member or are subscribed to Academy newsletters.

Our ophthalmologists have answered thousands of questions about eye diseases and conditions. Search our entire Ask an Ophthalmologist collection to find the answers you need.Read our important medical disclaimer.You can also browse by topic to see how physicians answered questions about a specific eye condition:

Numerical apertureof optical fiber

Not every question will receive a direct response from an ophthalmologist. However, we will follow up with suggested ways to find appropriate information related to your question. Medical disclaimer

All content on the Academy’s website is protected by copyright law and the Terms of Service. This content may not be reproduced, copied, or put into any artificial intelligence program, including large language and generative AI models, without permission from the Academy.

Numerical apertureformula

Anti-reflective coatings are heavily promoted by dispensing opticians. The coating does just what the name implies, that is, it decreases reflections of bright lights off of the glasses. Anti-reflective coatings also very slightly increase the light transmission of eyeglass lenses, but the increase is so small almost no one notices it. If you are someone who makes public appearances wherein spotlights or other bright lights shine on your face, anti-reflective coatings will make you more photogenic. Be aware that most of the lower-cost anti-reflective coatings make the glasses lenses difficult to keep clean. (Unfortunately, anti-reflective coatings are often sold as protection against glare, but the glare protection from an anti-reflective coating is very slight. Adequate glare protection requires a polarized lens, which is only available in darkly tinted lenses.)

By submitting your question, you agree to be answered by email. Your email address will only be used to answer your question unless you are an Academy member or are subscribed to Academy newsletters.