System and method for eye orientation

Patent metadata

Field	Value
Publication number	US-10028654-B2
Application number	US-201414196912-A
Country	US
Kind code	B2
Filing date	Mar 4, 2014
Priority date	Mar 15, 2013
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

Systems and methods for locating the center of a lens in the eye are provided. These systems and methods can be used to improve the effectiveness of a wide variety of different ophthalmic procedures. In one embodiment, a system and method is provided for determining the center of eye lens by illuminating the eye with a set of light sources, and measuring the resulting first image of the light sources reflected from an anterior surface of the lens and the resulting second image of the light sources reflected from a posterior surface of the lens. The location of the center of the lens of the eye is then determined using the measurements. In one embodiment, the center of the lens is determined by interpolating between the measures of the images. Such a determination provides an accurate location of the geometric center of the lens.

First claim

What is claimed is:

1. An eye imaging assembly comprising:
an illumination device positioned to illuminate a patient's eye, the illumination device configured to emit one or more light beams from the illumination device;
an imaging device comprising a detector positioned to capture one or more images of the patient's eye;
a processor operatively coupled to the illumination device and the imaging device; and a non-transitory computer readable medium that stores a computer program that, when executed, causes the processor to perform or enable the following steps:
emit the one or more light beams into the patient's eye;
detect one or more eye images with the detector of the imaging device, the one or more eye images comprising a single Purkinje III reflection which is a reflection of the one or more light beams by an anterior surface of a lens of the eye and which forms a part of a circle, and a single Purkinje IV reflection which is a reflection of the one or more light beams by a posterior surface of a lens of the eye and which forms a part of another circle;
determine a Purkinje III diameter and a Purkinje III center location which are respectively a diameter and a center of the circle of the single Purkinje III reflection;
determine a Purkinje IV diameter and a Purkinje IV center location which are respectively a diameter and a center of the circle of the single Purkinje IV reflection;
determine a distance between the Purkinje III center location and the Purkinje IV center location; and
determine a location of a center of the lens of the eye using only the Purkinje III diameter, the Purkinje III center location, the Purkinje IV diameter, the Purkinje IV center location, and the distance between the Purkinje III center location and the Purkinje IV center location which have been determined from the single Purkinje III reflection and the single Purkinje IV reflection.

2. The eye imaging assembly of claim 1 , wherein the location of the center of the lens of the eye is determined as corresponding to a position on a line between the Purkinje III center location and the Purkinje IV center location at a distance X 1 from the Purkinje III center location, where X 1 is defined as:

X
1

=

L
⁡

(

D
4

D
3

+

D
4

)

,

where L is defined as the distance between the Purkinje III center location and the Purkinje IV center location, D 3 is defined as the Purkinje III diameter, and D 4 is defined as the Purkinje IV diameter.

3. The eye imaging assembly of claim 1 , wherein the location of the center of the lens of the eye is determined as corresponding to a position on a line between the Purkinje III center location and the Purkinje IV center location at a distance X 2 from the Purkinje IV center location, where X 2 is defined as:

X
2

=

L
⁡

(

D
3

D
3

+

D
4

)

,

where L is defined as the distance between the Purkinje III center location and the Purkinje IV center location, D 3 is defined as the Purkinje III diameter, and D 4 is defined as the Purkinje IV diameter.

4. The eye imaging assembly of claim 1 , wherein the computer program, when executed, causes the processor to control the illumination device so as to adjust the one or more light beams until a position and/or a boundary of the lens capsule is detected.

5. The eye imaging assembly of claim 1 , wherein the wavelength of the one or more light beams is infrared or near infrared.

6. The eye imaging assembly of claim 1 , further comprising a guided user interface comprising a display, and wherein the calculated center is outputted onto the guided user interface (GUI) display.

7. The eye imaging assembly of claim 1 , wherein the one or more eye images detected with the detector of the imaging device comprises a Purkinje I reflection, and wherein the computer program, when executed, causes the processor to determine the Purkinje I diameter and a Purkinje I center location.

8. The eye imaging assembly of claim 1 , further comprising a wavefront aberrometer operatively coupled to the processor, the wavefront aberrometer being configured to measure a wavefront reflected from the eye of the patient.

9. The eye imaging assembly of claim 8 , wherein the computer program, when executed, causes the processor to control the imaging device and the wavefront aberrometer so as to simultaneously measure the Purkinje III reflection, the Purkinje IV reflection and the wavefront reflected from the eye of the patient.

10. The eye imaging assembly of claim 9 , wherein a center of the wavefront is correlated to the center of lens of the eye.

11. The eye imaging assembly of claim 8 , wherein the one or more eye images detected with the detector of the imaging device comprises a Purkinje I reflection, wherein the computer program, when executed, causes the processor to determine the Purkinje I diameter and a Purkinje I center location, and wherein the Purkinje I reflection is measured simultaneously with the Purkinje III reflection, Purkinje IV reflection and the reflected wavefront.

12. The eye imaging assembly of claim 8 , wherein the one or more eye images detected with the detector of the imaging device comprises a Purkinje I reflection, wherein the computer program, when executed, causes the processor to determine the Purkinje I diameter and a Purkinje I center location, and wherein a center of the reflected wavefront is correlated to a difference between the center point of the lens of the eye to the center point of the Purkinje I reflection.

Assignees

• Amo Dev Llc

Inventors

• Bor Zsolt
• Dennison Anthony
• Campos Michael
• De Guzman Peter Patrick

Classifications

• A61B3/1005 Primary

  for measuring distances inside the eye, e.g. thickness of the cornea (A61B3/11 takes precedence) · CPC title

• A61B3/14

  Arrangements specially adapted for eye photography · CPC title