Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Reexamination Certificate
2007-08-07
2007-08-07
Mai, Huy (Department: 2873)
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
C351S242000
Reexamination Certificate
active
10791848
ABSTRACT:
The apparatus for measuring differences in the transmission of light through a lens of an eye is an eye chart has two main sections including a test section that displays a shade of a test color and a reference section that displays either a spectrum of shades, or a different shade of, the test color. The chart is displayed in a box, projected on a wall or displayed as a chart hung on a wall. The chart is illuminated using a constant or variable intensity light source. A patient is required to find or make a match between the shades disposed on the chart. When the variable intensity light is used, the patient will be required to adjust the light intensity of the section it illuminates until a match in color shades is made. The chart may be used in conjunction with a Snellen eye chart.
REFERENCES:
patent: 2462485 (1949-02-01), Freeman
patent: 3801188 (1974-04-01), Hunt et al.
patent: 3844641 (1974-10-01), Nowak
patent: 3970376 (1976-07-01), Ledl
patent: 4212520 (1980-07-01), Klimsa
patent: 4327973 (1982-05-01), Raif
patent: 4365873 (1982-12-01), Ginsburg
patent: 4615594 (1986-10-01), Task
patent: 4711542 (1987-12-01), Ichihashi et al.
patent: 4848898 (1989-07-01), Massof
patent: 5078486 (1992-01-01), Evans
patent: 5430510 (1995-07-01), Pynson
patent: 5609159 (1997-03-01), Kandel et al.
patent: 5864364 (1999-01-01), Ohyama et al.
patent: 6210006 (2001-04-01), Menozzi
patent: 6220708 (2001-04-01), Koest
patent: 6379007 (2002-04-01), Farb
patent: 6851809 (2005-02-01), Sachtler
patent: 2004/0061835 (2004-04-01), Chen et al.
patent: 199 10 743 (2000-09-01), None
patent: WO 99/15071 (1999-04-01), None
Litman Richard C.
Mai Huy
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