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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.
Scintillating scotoma is a visual aura that may precede a migraine headache, but can also occur without headache. It causes flickering spots or patterns in the visual field, often resembling zigzag lines or fortifications, and lasts less than 60 minutes.
Macular degeneration, also known as age-related macular degeneration (AMD), is a condition that affects the central vision and may lead to blurred or no vision in the center of the visual field. Learn about the risk factors, types, diagnosis, prevention, and treatment options for AMD from this comprehensive Wikipedia article.
Learn about the different types of corrective lenses, such as glasses, contact lenses, and intraocular lenses, and how they are prescribed by eye care professionals. Find out how they improve visual perception and treat refractive errors, and the advantages and disadvantages of over-the-counter and self-selected lenses.
Astigmatism is a refractive error that causes blurred or distorted vision due to an irregular curvature of the eye. Learn about the types, causes, diagnosis and ...
Learn about the optical aberrations that affect the quality of vision in the human eye, such as spherical, coma and trefoil aberrations. Find out how they are measured, corrected and influenced by factors such as age, accommodation and pupil size.
During an eye examination, the presence of suppression and the size and location of the suppression scotoma may be the Worth 4 dot test (a subjective test that is considered to be the most precise suppression test), or with other subjective tests such as the Bagolini striated lens test, or with objective tests such as the 4 prism base out test.
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.
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