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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.
Learn about the different types of optical prisms, such as dispersive, reflective, beam-splitting and polarizing prisms, and how they refract, reflect or split light. Find out how prisms are made of transparent materials like glass, acrylic or fluorite, and how they can create spectra, images or polarizations.
Diplopia is the simultaneous perception of two images of a single object, which may be voluntary or involuntary. It can result from various ophthalmologic, neurological, or systemic disorders, and can be classified as monocular or binocular, acute or chronic, and suppressed or not.
Learn how to interpret and write an eyeglass prescription that includes sphere, cylinder and axis components. Sphere and cylinder specify the power of the lenses, and axis defines the orientation of the cylinder relative to horizontal and vertical.
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.
Learn about the three phases of hair growth cycle, the factors that affect hair growth rate and length, and the disorders that interfere with hair growth. Find out how hair is made of keratin, how it varies by color and texture, and how it stops growing after death.
Learn about glasses, also known as eyeglasses and spectacles, which are vision eyewear with clear or tinted lenses mounted in a frame. Find out about corrective, safety, sunglasses and other types of glasses, as well as their history and evolution.
Learn about optical coatings, thin layers of material that alter the way light reflects and transmits from optical components. Find out how metal coatings such as gold, silver and aluminium are used, and how they compare with dielectric coatings.