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Humphrey Vision Analyser |
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Analyser, Humphrey Vision Subjective refractometer utilizing continuously variable-power lenses developed by Alvarez. The image of a target is formed by this variable-power lens and is reflected by a concave mirror situated 3 m away from the patient. The vergence of light entering the eye can be changed by changing the power of the Alvarez lens: spherical, as well as astigmatic, errors of refraction and binocular vision tests can be made. The spherocylinder correction is automatically computed. See Alvarez lens; optometer. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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