Toposcope

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Toposcope

1. An instrument for measuring the curvature of the surfaces of a contact lens, based on moiré fringes. A bar pattern is reflected from the lens surface and the reflected image is viewed with a microscope that has a second bar pattern in the eyepiece. The two bar patterns superimposing each other at slightly different orientations create the moiré patterns. The magnification of the microscope is changed until the fringes are parallel to the central index line seen in the field and a dial monitoring this change in magnification indicates the radius of curvature in millimetres.

2. See non-invasive break-up time test. See back optic zone radius; radiuscope.

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