System and method for determining ocular scattering

Patent metadata

Field	Value
Publication number	US-9301676-B2
Application number	US-201414452856-A
Country	US
Kind code	B2
Filing date	Aug 6, 2014
Priority date	Aug 6, 2013
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

Improved systems and methods for determining ocular scattering are provided. These systems and methods can be used to quantify ocular scattering before and/or after a wide variety of different ophthalmic diagnostic procedures, and various surgical and non-surgical treatments. One embodiment provides a system and method for determining ocular scattering that uses two light detectors, with one detector configured to detect light over a relatively narrow angular range, and the other detector configured to detect light over a relatively large angular range. The data from the narrow angular range and the large angular range can then be analyzed to determine a measurement of ocular scattering.

First claim

What is claimed is:

1. A system for determining ocular scattering, the system comprising:
a light source configured to illuminate an eye;
a first detector configured to detect a first portion of light deflected from the eye and to generate first data indicative of the first portion of light, wherein the first detector is configured such that the first portion of light corresponds to light deflected from the eye over a first angular range;
a second detector configured to detect a second portion of light deflected from the eye and to generate second data indicative of the second portion of light, wherein the second detector is configured such that the second portion of light corresponds to light deflected from the eye over a second angular range, wherein the second angular range is larger than the first angular range;
a processing system coupled to the first detector and the second detector, the processing system configured to analyze the first data and the second data to determine a measurement of ocular scattering.

2. The system of claim 1 wherein the processing system is configured to analyze the first data and the second data to determine the measurement of the ocular scattering by integrating the first data over the first angular range and integrating the second data over the second angular range.

3. The system of claim 1 wherein the processing system is configured to analyze the first data and the second data to determine the measurement of the ocular scattering by calculating a ratio between a difference in the first data and the second data and a summation of the first data and the second data.

4. The system of claim 1 wherein the first data comprises a first point spread intensity profile corresponding to the first angular range and wherein the second data comprises a second point spread intensity profile corresponding to the second angular range.

5. The system of claim 1 wherein the processing system is configured to analyze the first data and the second data to determine the measurement of the ocular scattering by calculating:

1
-

[

L
1

-

L
2

L
1

+

L
2

]

where L 1 comprises an integration of the first data over the first angular range and where L 2 comprises an integration of the second data over the second angular range.

6. The system of claim 1 wherein the first detector and the second detector comprise detectors selected from the group consisting of a light phase sensor and an intensity sensor.

7. The system of claim 1 wherein the first detector comprises a sensor selected from the group consisting of: Shack-Hartmann wavefront sensor, charge-coupled device sensor, complementary metal-oxide-semiconductor sensor, photomulitplier tube sensor, small angle microscope sensor, and spectral meter.

8. The system of claim 1 wherein the second detector comprises a sensor selected from the group consisting of: charge-coupled device sensor, complementary metal-oxide-semiconductor sensor, photomulitplier tube sensor, large angle microscope sensor, and spectral meter.

9. The system of claim 1 wherein the second detector is configured to move to detect the second portion of light over the second angular range.

10. The system of claim 1 wherein the light source is configured to move to generate scattered light over the second angular range.

11. The system of claim 1 wherein the light source is configured to generate light having a modulated wavefront phase.

12. The system of claim 1 wherein the light source is configured to generate light having a modulated intensity to mimic different light conditions.

13. The system of claim 1 wherein the first angular range comprises less than +/−10 degrees and wherein the second angular range comprises at least +/−60 degrees.

14. The system of claim 1 wherein the first angular range comprises less than +/−2 degrees and wherein the second angular range comprises at least +/−110 degrees.

15. The system of claim 1 wherein the eye is selected from a group consisting of a living eye, a cadaver eye, or a model eye.

16. The system of claim 1 wherein a function of the eye is modified with an ophthalmological device.

17. A system for determining ocular scattering, the system comprising:
a light source configured to illuminate an eye;
a first detector configured to detect a first portion of light deflected from the eye and to generate first data indicative of the first portion of light, and where the first detector is configured such that the first portion of light corresponds to light deflected from the eye over a first angular range;
a second detector configured to detect a second portion of light deflected from the eye and to generate second data indicative of the second portion of light, and where the second detector is configured such that second portion of light corresponds to light deflected from the eye over a second angular range, where the second angular range is larger than the first angular range;
a processing system coupled to the first detector and the second detector, the processing system configured to:
receive the first data and the second data;
integrate the first data over the first angular range to determine a value L 1 ,
integrate the second data over the second angular range to determine a value L 2 ,
determine a measurement of ocular scattering by calculating;

1
-

[

L
1

-

L
2

L
1

+

L
2

]

and outputting the measurement of ocular scattering.

18. A method for determining ocular scattering, the method comprising:
illuminating an eye;
detecting a first portion of light deflected from the eye and generating first data indicative of the first portion of light, where the first portion of light corresponds to light deflected from the eye over a first angular range;
detecting a second portion of light deflected from the eye and generating second data indicative of the second portion of light, where the second portion of light corresponds to light deflected from the eye over a second angular range, and where the second angular range is larger than the first angular range; and
analyzing the first data and the second data to determine a measurement of ocular

Assignees

• Abbott Medical Optics Inc

Inventors

• Zhao Huawei
• Chen Li

Classifications

• A61B3/10 Primary

  Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions · CPC title

• A61B3/0008

  provided with illuminating means (A61B3/117, A61B3/14 take precedence) · CPC title