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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 eye chart is a chart used to measure visual acuity comprising lines of optotypes in ranges of sizes. Optotypes are the letters or symbols shown on an eye chart. Learn about the history, types, and procedure of eye charts.
A Snellen chart is an eye chart that can be used to measure visual acuity by reading letters of different sizes. The chart is named after Herman Snellen, who developed it in 1862, and it is used to express vision as a fraction, such as 6/6 or 20/20.
Distance vision corrections are made by re-adjusting the lens for distance, instead of by tilting and/or rotating the head to view object through the best part of the lens for the distance. Adjustable focus lenses, like single-focus lenses, also reduce image-jump and spatial distortion in the field of view associated with traditional multi ...
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.
Vertex distance is the distance between the back surface of a corrective lens and the front of the cornea. It affects the optical properties and power of the lens relative to the eye. Learn how to calculate and adjust vertex distance for glasses and contacts.
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