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US 6,554,429 B1Granted
Method for determining accommodation
AssigneeAlcon Inc.
InventorsJohn A. Campin, Gary P. Gray, George Pettit
Life of this patent
Estimating the term…
Abstract
An automated, objective method for determining the accommodative range and aberration profile of an eye using a wavefront sensor that iteratively determines the change in accommodation of the lens of an eye.
Claims2
A method of determining an accommodative range of an eye, comprising the steps of:
- a) taking a first wavefront measurement of an eye using a wavefront sensor;
- b) calculating a first effective clinical prescription using the first wavefront measurement;
- c) adjusting the focusing optics of the wavefront sensor in a discrete step in the hyperopic direction;
- d) taking a second wavefront measurement of the eye after adjusting the focusing optics of the wavefront sensor in the first discrete step in the hyperopic direction;
- e) calculating a second effective clinical prescription using the second wavefront measurement;
- f) determining the difference between the first effective clinical prescription and the second effective clinical prescription;
- g) comparing the difference between the first effective clinical prescription and the second effective clinical prescription against an allowed tolerance;
- h) repeating steps c) through g) until the difference between the first effective clinical prescription and the second effective clinical prescription is less than the allowed tolerance;
- i) adjusting the focusing optics of the wavefront sensor in a discrete step in the myopic direction;
- k) taking a third wavefront measurement of the eye after adjusting the focusing optics of the wavefront sensor in the first discrete step in the myopic direction;
- l) calculating a third effective clinical prescription using the third wavefront measurement;
- m) determining the difference between the second effective clinical prescription and the third effective clinical prescription;
- n) comparing the difference between the second effective clinical prescription and the third effective clinical prescription against an allowed tolerance;
- o) repeating steps i) through n) until the difference between the second effective clinical prescription and the third effective clinical prescription is less than the allowed tolerance;
- and
- p) calculating an accommodative range of the eye by comparing the effective clinical prescription taken at step l with the effective clinical prescription taken at step e.
13 more elements
A method of determining an aberration profile of an eye, comprising the steps of:
- a) taking a first wavefront measurement of an eye using a wavefront sensor;
- b) calculating a first effective clinical prescription using the first wavefront measurement;
- c) adjusting the focusing optics of the wavefront sensor in a discrete step in the hyperopic direction;
- d) taking a second wavefront measurement of the eye after adjusting the focusing optics of the wavefront sensor in the first discrete step in the hyperopic direction;
- e) calculating a second effective clinical prescription using the second wavefront measurement;
- f) determining the difference between the first effective clinical prescription and the second effective clinical prescription;
- g) comparing the difference between the first effective clinical prescription and the second effective clinical prescription against an allowed tolerance;
- h) repeating steps c) through g) until the difference between the first effective clinical prescription and the second effective clinical prescription is less than the allowed tolerance;
- i) adjusting the focusing optics of the wavefront sensor in a discrete step in the myopic direction;
- k) taking a third wavefront measurement of the eye after adjusting the focusing optics of the wavefront sensor in the first discrete step in the myopic direction;
- l) calculating a third effective clinical prescription using the third wavefront measurement;
- m) determining the difference between the second effective clinical prescription and the third effective clinical prescription;
- n) comparing the difference between the second effective clinical prescription and the third effective clinical prescription against an allowed tolerance;
- o) repeating steps i) through n) until the difference between the second effective clinical prescription and the third effective clinical prescription is less than the allowed tolerance;
- and
- p) calculating an aberration profile of the eye by comparing the effective clinical prescription taken at each iterative step.
13 more elements
Dependencies are inferred from the claim text.