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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.
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 ...
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.
Micropsia is a condition of visual perception in which objects appear smaller than they are. It can be caused by optical, retinal, brain or psychological factors, and can be diagnosed by various tests and imaging techniques.
Homonymous hemianopsia is a visual field loss on the same side of both eyes, caused by brain injury or damage. Learn about the signs, symptoms, causes, diagnosis, and management of this condition, and see examples of how it affects vision.
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.
Learn about the different types of optical prisms, such as dispersive, reflective, beam-splitting, polarizing and biprism, and how they refract, reflect or split light. Find out how prisms are made, used and affected by various factors such as wavelength, angle, material and coating.
Astigmatism is an optical aberration where rays from different planes have different foci. Learn about the forms, causes, and corrections of astigmatism in optical systems and vision science.