We have fabricated a single hologram with which to determine the spherical refractive error of the human eye in the range 5 to diopters (D) with an accuracy of in a single step. The amplitude of accommodation is determined at the same time. The hologram is a record of 16 targets, each of which has a different image vergence in the range 5 to in steps of 0.5 D. This idea can be applied readily to any dioptric range. The measurement method is simple, fast, and reliable.
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