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A New Test of Visual Acuity Using a Holographic Phase Grating and a Laser
Thomas W. Smith, MD;
Paul W. Remijan, PhD;
Walter Remijan;
Hansjoerg E. Kolder, MD, PhD;
Joanie Snyder
From the Department of Ophthalmology, University of Iowa Hospitals and Clinics, Iowa City (Drs Smith and Kolder and Ms Snyder); Institute of Optics, University of Rochester, Rochester, NY (Dr Remijan); and Randwal Instrument and Machine, Southbridge, Mass (Mr Remijan).
Arch Ophthalmol. 1979;97(4):752-754.
Abstract
• A new visual acuity testing device is able to determine a specific visual acuity of the retina even in the presence of opacities of the ocular media, such as a cataract. This is achieved by forming two spatially coherent, quasimonochromatic point sources near the nodal point of the eye. The two spherical waves that emanate from the point sources interact to produce a pattern of stripes on the retina. The intensity of the pattern is easily varied. More importantly, the pattern can be projected over different-sized retinal areas corresponding to visual fields of 0.5 to 15° in diameter. The device may be useful for vision research and preoperative assessments of visual potential.
Footnotes
Accepted for publication May 1, 1978.
Reprint requests to C. S. O'Brien Library, Department of Ophthalmology, University of Iowa Hospitals, Iowa City, IA 52242 (Dr Smith).
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