Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1993-05-14
1995-03-14
Sikes, William L.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351244, 351246, A61B 302
Patent
active
053980859
ABSTRACT:
A device for testing vision potential of humans comprises an enclosure containing two transparent areas through one surface, two pairs of rollers, means for turning one of the rollers, a length of material fitted around the two pairs of rollers in snug engagement therewith so that by operating the means for turning one of the rollers the material moves around the two pairs of rollers, said material having a series of vision testing lines of indicia sized to test visual acuity from 20/20 to 20/200, each of said lines being visible in one area and each of said lines having on the material and visible through the other area markings from 20/20 to 20/200. Two sources of illumination are disposed within the enclosure, one illumination source being disposed in a position to illuminate the line of indicia and the other being positioned to illuminate the series of numbers from 20/20 to 20/200. Means for providing sufficient energy to the illumination means to enable them to provide illumination and means for positioning the person to be tested at the desired from the device are provided. The device has particular applicability for determining the vision potential of humans having a cataract in one or both eyes which through utilizing a device with a pinhole through which the person to be tested views the lines of indicia one can accurately determine the visual acuity which will be achieved following cataract surgery.
REFERENCES:
patent: 666557 (1901-01-01), Reich et al.
patent: 726101 (1903-04-01), Reich et al.
patent: 5054908 (1991-10-01), Katsumi et al.
Mai Huy
Sikes William L.
LandOfFree
Device for testing vision potential does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for testing vision potential, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for testing vision potential will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-715917