Ophthalmic Aberrometer Capable of Subjective Refraction

摘要

The present invention contemplates an ophthalmic aberrometer combining measurements of wavefront aberrations and subjective refraction into a single instrument and refers both measurements to the same corneal plane The present invention also contemplates an ophthalmic aberrometer employing an open field and subjective correction to overcome instrument myopia and to ensure accurate measurement of the best-corrected visual acuity in addition to measurement of wavefront aberrations. The present invention further contemplates an ophthalmic aberrometer implementing an optical relay with adjustable optical power compensation to eliminate the need for flipping plurality sets of trial lenses for defocus correction. The present invention also further contemplates an ophthalmic aberrometer making wavefront measurement along a viewing path of the subject eye and enabling accurate measurement of the residual wavefront aberrations after compensating for the subjective refraction.

主权项

1. An ophthalmic aberrometer capable of subjective refraction, comprising:
a viewing path enabling a subject eye to look through and to fixate at/on a distance viewing chart; a defocus compensator disposed along said viewing path to compensate for defocus error of said subject eye; an astigmatism compensator disposed along said viewing path to compensate for cylindrical error of said subject eye; an ophthalmic wavefront sensor disposed along said viewing path to measure objectively the wavefront aberrations of said subject eye, wherein, said ophthalmic wavefront sensor is capable of measuring high order aberrations for a 6 mm pupil or larger; a pupil camera disposed along said viewing path to monitor pupil position of said subject eye; an objective adjustment mechanism coupled with said wavefront sensor to drive said defocus compensator and said astigmatism compensator; and a subjective adjustment mechanism enabling feedback from said subject eye to refine said defocus compensator and said astigmatism compensator; wherein said ophthalmic aberrometer is capable of measuring wavefront aberrations while also providing a subjective refraction of said subject eye, which looks through said ophthalmic aberrometer and focuses at/on said distance viewing chart.