[Experimental research on the accuracy of the method of fixation topogometry]

The accuracy of fixation topogometry that allows to assess the form of the cornea along its whole surface has been studied experimentally. For this purpose, a special metallic standard with a mirror surface has been manufactured, representing a paraboloid of rotation (by the formula Y2 = 2RX, where R = 7.7 mm). The standard was fixated on a face support of ophthalmometers (of the firms "Rodenstock" and "Karl Zeiss") by means of a support providing transference of the standard in two reciprocally perpendicular meridians on the given (5-35) number of grades. The measurements were made in 15 points. At first sagittal radii of the cornea were determined, then the distance height of the points from the central axis (h) and the sag (P) were calculated. The position of points built with the help of P and h in coordinate axes was compared with the standard curve. The range of divergences was minimum (0.01-0.04 mm), this speaking about sufficient accuracy of the method of fixation topogometry.