| 摘要 |
A new lens system and method of use for otherwise conventional refractors comprising a five-lens, variable crossed cylinder lens attachment and selectable fixed crossed cylinders which may be placed in the examining optical path. The variable crossed cylinder lens attachment includes two pairs of counter rotating cylinder lenses, each of which may be manipulated independent of the other, and a stationary sphere lens. The assembly also is connected to a computer so that the measurement of astigmatism may be made automatically. In addition, refractive techniques utilizing the disclosed crossed cylinder lens systems are described.
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