Rectilinear photokeratoscope

Details Rectilinear photokeratoscope Rectilinear photokeratoscope

A - Human Necessities

61

B

A61B 3/107 (2006.01) A61B 3/103 (2006.01)

Patent

CA 2080668

A rectilinear keratoscope for determining the curvature of the anterior corneal surface of an eye. The keratoscope includes a translucent sheet having a curved pattern in the shape of a grid of intersecting individual curved lines. The pattern forms a substantially rectilinear grid image when reflected from a curved surface having a known radius of curvature. Deviations from a spherical surface can be qualitatively and quantitatively determined from examining the nature of the reflected image pattern and by measuring the spatial frequency of grid lines lying between a reference point and an image point corresponding to a point on the surface of the cornea whose refractive power is to be measured.

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