Wavefront sensorless adaptive correction of the wave aberration for an eye

摘要

Embodiments of the invention generally provide apparatuses and methods utilized in optics, and more specifically to apparatuses and methods for adaptive optics correction and imaging. Real-time wavefront sensorless adaptive optics correction and imaging is used with the living human eye to produce optical quality rivaling that of wavefront sensor based control in the similar systems. Using an optimization algorithm that is based on an image quality metric, the apparatus and method optimize the optical quality in ocular image frames acquired with an adaptive optics system.

主权项

1. A method of performing adaptive optics correction of an eye, the method comprising the steps of:
a. causing light to enter the eye; b. receiving a first image of the light emitted or reflected from the eye; c. computing a first image quality metric value for at least a portion of the first received image; d. using an optimization algorithm that is based on an image quality metric to adjust a first correcting element to increase the computed image quality metric value for at least a portion of subsequently received images of the eye, wherein the optimization algorithm is a stochastic parallel gradient descent algorithm, wherein the stochastic parallel gradient descent algorithm is defined as:
uik+1=uik+Γ(ΔJk)(δuik) wherein Γ is a gain parameter that determines the amount of voltage change applied to the first correcting element in response to a computed image quality metric value, uik is a control signal for an actuator that controls the first correcting element, δuik is a random perturbation applied to the control signal, and ΔJk is a computed image quality metric value; e. receiving a second image of the light emitted or reflected from the eye; f. computing a second image quality metric value for at least a portion of the second received image; and g. repeating steps a through f until a computed image quality metric value reaches a predefined value.