Method for measuring refractive power and apparatus therefor

Details Method for measuring refractive power and apparatus therefor Method for measuring refractive power and apparatus therefor

2005-08-30

2005-08-30

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

Refraction testing

C356S124000

Reexamination Certificate

active

06937328

ABSTRACT:
A refractive power measuring method is disclosed wherein a pattern plate8is disposed at a certain position in a measuring optical path in a measuring optical system1, a measuring light emitted from a measuring light source5is received by a photosensor9through the pattern plate8, a soft contact lens TL is disposed at a certain position in the measuring optical path, and a change of a pattern light received by the photosensor9is obtained to determine optical characteristic values of the soft contact lens. According to this method, the soft contact lens TL is disposed in a wet state at a certain position of the measuring optical path and scattered light resulting from scatter of the measuring light on a surface of the soft contact lens TL is received by the photosensor9, then a state of scatter of the scattered light is determined from a change of a received light signal outputted from the photosensor9and there are obtained optical characteristic values when the received light signal is below a preset value.

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