An objective inspection method of visual acuity based on wave front aberrations of human eye

Visual acuity is an important vision evaluation index. Visual acuity examination has great practical and clinical significance. Objective visual acuity detection method based on the wave front aberrations of human eyes is explored in this paper. The wavefront aberrations of human eyes were measured with the Hartmann–Shack wavefront sensor and modulation transfer function was computed from the wave front aberrations. The maximum spatial resolution of human eye was obtained from modulation transfer function and the retinal aerial image modulation. Visual acuity can be derived from the maximum spatial resolution of human eye. Visual acuity of randomly selected 15 eyes was examined with the objective method based on wavefront aberrations of human eyes and with the subjective visual chart method as well. The test results show that the visual acuity values are basically the same when visual acuity is tested with the two methods. The inspection method of visual acuity based on wavefront aberrations of human eyes possesses advantages of objectivity, rapidity and accuracy, without the shortcomings of the visual chart method of slowness and subjectivity relying much on subject cognition and statement.