Laser Speckle Visual Tester.
DEPARTMENT OF THE NAVY WASHINGTON D C
Pagination or Media Count:
A laser apparatus is invented for projecting a laser speckle pattern on a suitable surface. A subject whose visual acuity is being tested observes the speckle pattern on the surface with one eye at a time. The subject moves his head or the surface is moved in a designated direction. If hyperopia or myopia is present, the subject can observe apparent movement of the speckle pattern. The speed of the pattern movement apparent to the subject can be measured to determine the degree of any myopic or hyperopic condition present and the optical correction required for each eye.
- Medical Facilities, Equipment and Supplies