Principal of AR(Auto refractometer)
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YouTubeEYE CARE OPTOM
Principal of AR(Auto refractometer)
1. Badal Optometer Principle The Badal principle uses a single positive lens to change the vergence of light entering the eye by physically moving an internal target. The Setup: An internal target is placed behind a converging lens. The lens is positioned exactly one focal length away from the patient’s eyes (the eye's anterior focal point ...
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