Ophthalmic test apparatus having magnification compensation

Details Ophthalmic test apparatus having magnification compensation Ophthalmic test apparatus having magnification compensation

A - Human Necessities

61

B

88/121.5

A61B 3/00 (2006.01) A61B 3/036 (2006.01) A61B 3/04 (2006.01)

Patent

CA 1160877

OPHTHALMIC TEST APPARATUS HAVING MAGNIFICATION COMPENSATION ABSTRACT OF THE DISCLOSURE In apparatus for determining the refractive correction for a patient's eye, a plurality of similar test targets are presented to the patient simultaneously, with these test targets being viewed through different trial refractive corrections for the patient to choose between. Magnification differences produced by the different trial refractive corrections are compensated for by altering the size or shape of the different test targets, such that when magnified by the respective trial refractive correction, each test target appears of normal size and shape to the patient, not interfering with the patient's judgment of best clarity.

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