Wavefront curvature sensing for the human eye

Torti, C.; Gruppetta, Steve; Diaz-Santana, Luis

doi:10.1080/09500340701470037

Cited by 9 publications

(5 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Curvature sensors have, in exploratory investigations, been successfully utilized to measure ocular aberrations [23], [24]. In these experiments, however, the sensors have not been used in combination with deformable mirrors, but were instead derived in terms of a complex wavefront reconstruction algorithm.…”

Section: Resultsmentioning

confidence: 99%

Automatic sensitivity adjustment for a curvature sensor

2010

View full text Add to dashboard Cite

There are different techniques to sense the wavefront phase-distortions due to atmospheric turbulence. Curvature sensors are practical in their sensitivity being adjustable to the prevailing atmospheric conditions. Even at the best sites, the turbulence intensity has been found to vary at times over only a few minutes and regularly over longer periods. Two methods to automatically adjust the sensitivity of a curvature sensor are proposed: First, the defocus distance can be adjusted prior to the adaptive-optics (AO) loop through the acquisition of a long exposure image and can then be kept constant. Secondly, the defocus distance can be changed during the AO loop, based on the voltage values sent to the deformable mirror. We demonstrate that the performance increase -assessed in terms of the image Strehl-ratio -can be significant.

show abstract

Section: Resultsmentioning

confidence: 99%

Automatic sensitivity adjustment for a curvature sensor

2010

View full text Add to dashboard Cite

show abstract

“…In 2006, Díaz-Doutón et al adapted a CS for an ocular aberration measurement for the first time and obtained a similar performance to that of the S–H sensor [ 61 ]. Similarly, Torti et al [ 62 ] investigated the feasibility of using a curvature sensor in the ophthalmic field and evidenced that, as compared to S–H sensor, the curvature WF sensor was not limited anymore by the features of the lenslet array, showing a larger dynamic range [ 15 , 62 ]. However, it is fundamental to find a good trade-off, which requires a prolonged time of computing.…”

Section: Wavefront Sensors For Ophthalmological Applications: Physica...mentioning

confidence: 99%

Advanced Optical Wavefront Technologies to Improve Patient Quality of Vision and Meet Clinical Requests

et al. 2022

View full text Add to dashboard Cite

Adaptive optics (AO) is employed for the continuous measurement and correction of ocular aberrations. Human eye refractive errors (lower-order aberrations such as myopia and astigmatism) are corrected with contact lenses and excimer laser surgery. Under twilight vision conditions, when the pupil of the human eye dilates to 5–7 mm in diameter, higher-order aberrations affect the visual acuity. The combined use of wavefront (WF) technology and AO systems allows the pre-operative evaluation of refractive surgical procedures to compensate for the higher-order optical aberrations of the human eye, guiding the surgeon in choosing the procedure parameters. Here, we report a brief history of AO, starting from the description of the Shack–Hartmann method, which allowed the first in vivo measurement of the eye’s wave aberration, the wavefront sensing technologies (WSTs), and their principles. Then, the limitations of the ocular wavefront ascribed to the IOL polymeric materials and design, as well as future perspectives on improving patient vision quality and meeting clinical requests, are described.

show abstract

“…The three masks depicted in the left column of Fig. 3 were optimized for minimum image error for three representative aberrations: astigmatism, coma, and an irregular phase aberration not atypical of the human eye [18][19][20]. The black areas represent opaque areas of the mask, and the hue of the transmissive areas indicates the pupil phase.…”

Section: /Comentioning

confidence: 99%

Correction of optical phase aberrations using binary-amplitude modulation

Vettenburg

Harvey

2011

J. Opt. Soc. Am. A

View full text Add to dashboard Cite

We show that phase aberrations in an imaging system can be mitigated using binary-amplitude masks that reduce destructive interference in the image spatial frequency domain. Appropriately designed masks increase the magnitude of the optical transfer function and prevent nulls. This offers a low-cost, transmission-mode alternative to phase correction as used in active and adaptive optics, without a restriction on the waveband of operation.

show abstract

Wavefront curvature sensing for the human eye

Cited by 9 publications

References 29 publications

Automatic sensitivity adjustment for a curvature sensor

Automatic sensitivity adjustment for a curvature sensor

Advanced Optical Wavefront Technologies to Improve Patient Quality of Vision and Meet Clinical Requests

Correction of optical phase aberrations using binary-amplitude modulation

Contact Info

Product

Resources

About