Journal ArticleDOI
Objective measurement of wave aberrations of the human eye with the use of a Hartmann-Shack wave-front sensor
Reads0
Chats0
TLDR
It is shown that with this method, using a Hartmann-Shack wave-front sensor, one can obtain a fast, precise, and objective measurement of the aberrations of the eye.Abstract:
A Hartmann-Shack wave-front sensor is used to measure the wave aberrations of the human eye by sensing the wave front emerging from the eye produced by the retinal reflection of a focused light spot on the fovea. Since the test involves the measurements of the local slopes of the wave front, the actual wave front is reconstructed by the use of wave-front estimation with Zernike polynomials. From the estimated Zernike coefficients of the tested wave front the aberrations of the eye are evaluated. It is shown that with this method, using a Hartmann-Shack wave-front sensor, one can obtain a fast, precise, and objective measurement of the aberrations of the eye.read more
Citations
More filters
Journal ArticleDOI
Supernormal vision and high-resolution retinal imaging through adaptive optics
TL;DR: A fundus camera equipped with adaptive optics is constructed that provides unprecedented resolution, allowing the imaging of microscopic structures the size of single cells in the living human retina.
Journal ArticleDOI
Aberrations and retinal image quality of the normal human eye.
Junzhong Liang,David R. Williams +1 more
TL;DR: A wave-front sensor is constructed to measure the irregular as well as the classical aberrations of the eye, providing a more complete description of the Eye, indicating that they are not random defects.
Journal ArticleDOI
Statistical variation of aberration structure and image quality in a normal population of healthy eyes.
TL;DR: It is inferred that subjective best focus occurs when the area of the central, aberration-free region of the pupil is maximized, and that correction of the 12 largest principal components, or 14 largest Zernike modes, would be required to achieve diffraction-limited performance on average for a 6-mm pupil.
Journal ArticleDOI
Monochromatic aberrations of the human eye in a large population.
TL;DR: In this paper, a modified Hartmann-Shack wavefront sensor was used to measure the monochromatic wave aberration of both eyes for 109 normal human subjects across a 5.7mm pupil.
Patent
Method and apparatus for improving vision and the resolution of retinal images
David R. Williams,Junzhong Liang +1 more
TL;DR: In this paper, a point source produced on the retina of a living eye by a laser beam is reflected from the retina and received at a lenslet array of a Hartmann-Shack wavefront sensor such that each of the lenslets in the lenslet arrays forms an aerial image of the retinal point source on a CCD camera located adjacent to the array.
References
More filters
Journal ArticleDOI
Wave-front estimation from wave-front slope measurements
TL;DR: In this paper, the problem of wavefront estimation from wave-front slope measurements has been examined from a least-squares curve fitting model point of view, and a new zonal phase gradient model is introduced and its error propagator, which relates the mean square wavefront error to the noisy slope measurements, has been compared with two previously used models.
Journal ArticleDOI
Optical quality of the human eye.
F. W. Campbell,R. W. Gubisch +1 more
TL;DR: Optical quality of the eye was measured at eight pupil sizes between 1·5 and 6·6 mm diameter by recording the faint light emerging from the eye; this light was reflected from the bright image of a thin line on the fundus.
Journal ArticleDOI
A subjective method for the measurement of monochromatic* aberrations of the eye
TL;DR: The optical MTF of the authors' subjects’ eyes is computed and it is found that the role of aberrations in degrading the MTF may be greater than generally believed.
Journal ArticleDOI
Objective technique for the determination of monochromatic aberrations of the human eye.
TL;DR: The subjective crossedcylinder aberroscope method of Howland and Howland as discussed by the authors has been modified by the addition of a beam splitter and a camera to permit direct photographic recording of the distorted retinal image of the aberronscope grid.
Journal ArticleDOI
Modal wave-front estimation from phase derivative measurements
TL;DR: In this paper, it is shown that it is desirable to minimize the number of modes estimated and the amount of measurements used to maintain the quality of the estimates of low-order modes, and that cross coupling occurs when one tries to estimate modes higher than astigmatism.
Related Papers (5)
Aberrations and retinal image quality of the normal human eye.
Junzhong Liang,David R. Williams +1 more