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Prentice's rule is a formula to calculate the amount of prism correction in a lens based on decentration and lens power. It can be used for prescribing, tolerance control, or determining unprescribed prism in eyeglasses.
Convergence insufficiency is a binocular vision disorder that affects the ability of the eyes to turn towards each other. It can cause symptoms such as double vision, eye strain, headache, and difficulty reading. Learn about the diagnosis, treatment, and prevalence of convergence insufficiency.
A corrective lens is a device that improves visual perception by correcting refractive errors. Learn about the different types of corrective lenses, such as glasses, contact lenses, intraocular lenses, and their prescriptions, uses, and advantages.
Presbyopia is a common age-related condition that affects the ability to focus on close objects. It is caused by hardening of the lens and ciliary muscle, and can be corrected with glasses, contact lenses, or surgery.
The devices won't help everybody with eye problems, Peterson noted, "but in many cases people can regain some level of independence, reading, the ability to perform tasks around the home," he said.
An intraocular lens (IOL) is a lens implanted in the eye to treat cataracts or correct vision problems. Learn about different kinds of IOLs, such as phakic, pseudophakic, multifocal, and adaptive, and how they are inserted and used.
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