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2. Vertex distance - Wikipedia

   en.wikipedia.org/wiki/Vertex_distance

   A phoropter measurement of a patient reads −8.00 D sphere and −5.25 D cylinder with an axis of 85° for one eye (the notation for which is typically written as −8 −5.25×85). The phoropter measurement is made at a common vertex distance of 12 mm from the eye.

3. Aniseikonia - Wikipedia

   en.wikipedia.org/wiki/Aniseikonia

   A way to demonstrate aniseikonia is to hold a near target (e.g., a pen or a finger) approximately 6 inches directly in front of one eye. The person then closes one eye, and then the other. The person should notice that the target appears larger to the eye that it is directly in front of.

4. Intraocular lens power calculation - Wikipedia

   en.wikipedia.org/wiki/Intraocular_lens_power...

   The aim of an accurate intraocular lens power calculation is to provide an intraocular lens (IOL) that fits the specific needs and desires of the individual patient. The development of better instrumentation for measuring the eye's axial length (AL) and the use of more precise mathematical formulas to perform the appropriate calculations have significantly improved the accuracy with which the ...

5. Pupillary distance - Wikipedia

   en.wikipedia.org/wiki/Pupillary_distance

   Web apps are used by a variety of online sellers of eyeglasses where an object of known size, such as a credit card, is needed to assist (size reference) the measurement process. [ 13 ] [ 14 ] Some mobile apps have eliminated the need for a reference object to make accurate PD measurements by leveraging depth imaging and advanced algorithms now ...

6. Angular diameter - Wikipedia

   en.wikipedia.org/wiki/Angular_diameter

   The angular diameter, angular size, apparent diameter, or apparent size is an angular separation (in units of angle) describing how large a sphere or circle appears from a given point of view. In the vision sciences , it is called the visual angle , and in optics , it is the angular aperture (of a lens ).

7. I tried those Pair Eyewear glasses with the magnetic ... - AOL

   www.aol.com/lifestyle/tried-those-pair-eyewear...

   You should also measure your current frames to make sure the new ones are a similar size. Pair offers only about 10 frame styles each for men and women, with five available for kids.