A new instrument for axial length measurement
A simple and low-cost A-mode device for ocular biometry is described. The A-mode echogram is visible at a liquid crystal display for reference, whereas the intrinsic measuring accuracy is 0.01 mm. The sound velocity in the various ocular media can be adjusted independently. Averaging is automatically performed over 128 successive A-lines and after insertion of keratometric data the power of a lens implant is calculated with either of the four installed algorithms.
KeywordsSound Velocity Axial Length Liquid Crystal Display Anterior Chamber Depth Corneal Curvature
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