Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1989-10-27
1992-04-14
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351229, A61B 302
Patent
active
051042142
ABSTRACT:
Trial frames including two independently rotatable cells alignable with each eye are disclosed. Each set of cells is designed to house a pair of either cylinder, polarized, prism, crossed cylinder or sphero-cylinder lenses as appropriate for correcting optical errors such as astigmatism, macular defects, or diplopia. Because the lenses associated with the cells are designed to rotate independently, no synchorinized gear mechanism is required. Moreover, because axes throughout the entire visual field may be generated using independent rotation of two lenses, the batteries of trial lenses used in connection with conventional trial frames need not be used. Adjustable spectacles and an alternative lens system also are disclosed. The adjustable spectacles are particularly useful for persons whose refractive error is changing relatively rapidly over a short period of time (such as persons recovering from cataract surgery) and who therefore cannot practically use conventional glasses or contact lenses. The lens systems may easily be adapted for use in the oculars of microscopes, telescopes, cameras, binoculars, kaleidoscopes, slit lamps, and other similar devices.
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Page 438 in Volume 5 of "System of Ophthalmology", entitled, Ophthalmic Optics and Refraction, by Duek-Elder and Agrams (1970).
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