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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.
Adjustable focus lenses, like single-focus lenses, also reduce image-jump and spatial distortion in the field of view associated with traditional multi-focal lenses. Additionally, the ideal near-vision correction can be achieved with precision, because the variable lenses emulate the focusing action of the youthful (non-presbyopic) eye.
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.
An ophthalmic trial frame is a tool used by ophthalmologists and optometrists to hold lenses and other accessories during refraction. Learn about its purpose, parts, uses and modern techniques.
Pair Eyewear lets you change your glasses by snapping on different magnetic tops. You can choose from dozens of styles, colors and themes, and save 15 percent with promo code YAHOO15.
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.
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