Ophthalmic Optics

Elementary Ophthalmic Optics

Elementary Ophthalmic Optics

out that we are convinced every student of refraction should make himself acquainted with Mr Parsons' work. It is exceedingly well arranged and clearly expressed and the mathematical problems are stated with such lucidity that no one with a fair knowledge of mathematics can fail to follow them I he work may be said to stand midway between Hartridges Refraction and Donder s big work while improv...

Adaptive optics for ophthalmic applications using a pyramid wavefront sensor.

A new adaptive optics system for the eye using a pyramid wavefront sensor interfaced in closed-loop with a piezoelectric deformable mirror is presented. Sensing parameters such as CCD integration time, pupil sampling and beam steering amplitude are tested on the bench and in vivo on several volunteers to optimize real-time optical correction. The system allows closed-loop operation at a frame r...

Dual-thread parallel control strategy for ophthalmic adaptive optics.

To improve ophthalmic adaptive optics speed and compensate for ocular wavefront aberration of high temporal frequency, the adaptive optics wavefront correction has been implemented with a control scheme including 2 parallel threads; one is dedicated to wavefront detection and the other conducts wavefront reconstruction and compensation. With a custom Shack-Hartmann wavefront sensor that measure...

Improving wavefront boundary condition for in vivo high resolution adaptive optics ophthalmic imaging

An ophthalmic adaptive optics (AO) imaging system is especially affected by pupil edge effects due to the higher noise and aberration level at the edge of the human pupil as well as the impact of head and eye motions on the pupil. In this paper, a two-step approach was proposed and implemented for reducing the edge effects and improving wavefront slope boundary condition. First, given an imagin...