OSN Cornea/External Disease Board Member Eric D. Donnenfeld, MD, and a panel of experts examined a series of unusual ...

FDA approvals in 2025 introduced novel therapies and devices across ophthalmic subspecialties, emphasizing sustained efficacy ...

As screen time increases and vision problems become more common at every age, many still misunderstand conditions like myopia ...

Different IOL calculators provided similar results in patients with a history of LASIK surgery, according to a study ...

Astigmatism (uh-STIG-muh-tiz-um) is a type of refractive error where one or more of the eye’s surfaces are not smooth and/or ...

Refractive errors are common eye issues that can cause blurry or distorted vision. Treatment usually involves wearing glasses or contact lenses or getting procedures ...

Several different types of eye surgery exist, including laser or traditional surgery and minimally invasive options. The specific treatment you need depends on many factors such as your eye condition ...

A refraction test is usually given as part of a routine eye examination. It may also be called a vision test. This test tells your eye doctor exactly what prescription you need in your glasses or ...

The Brix scale, derived from the refractive index of a solution at 20 degrees Celsius (68 Fahrenheit), is widely known. Originally, it was established by determining the weight percentage of sucrose ...

A property of a material that changes the speed of light, computed as the ratio of the speed of light in a vacuum to the speed of light through the material. When light travels at an angle between two ...