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2. Eyeglass prescription - Wikipedia

   en.wikipedia.org/wiki/Eyeglass_prescription

   An eyeglass prescription. Similar to medical prescriptions, eyeglass prescriptions are written on paper pads or included in a patient's electronic health record, and contain a number of different abbreviations and terms: DV is an abbreviation for distance vision. This specifies the part of the prescription designed primarily to improve far vision.

3. Snellen chart - Wikipedia

   en.wikipedia.org/wiki/Snellen_chart

   A Snellen chart is an eye chart that can be used ... eye to determine the best eyeglass prescription. ... cannot read the large E without glasses, but can read the 6/ ...

4. Vertex distance - Wikipedia

   en.wikipedia.org/wiki/Vertex_distance

   Vertex distance. Vertex distance is the distance between the back surface of a corrective lens, i.e. glasses (spectacles) or contact lenses, and the front of the cornea. ...

5. Autorefractor - Wikipedia

   en.wikipedia.org/wiki/Autorefractor

   Here, lenses are switched in and out of a phoropter and the patient is asked "which looks better" while looking at a chart. This feedback refines the prescription to one which provides the patient with the best vision.

6. Pinhole glasses - Wikipedia

   en.wikipedia.org/wiki/Pinhole_glasses

   Pinhole glasses, also known as stenopeic glasses, are eyeglasses with a series of pinhole-sized perforations filling an opaque sheet of plastic in place of each lens. Similar to the workings of a pinhole camera , each perforation allows only a very narrow beam of light to enter the eye which reduces the size of the circle of confusion on the ...

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