ABERRATION CORRECTION METHOD AND ABERRATION CORRECTION APPARATUS

• US 20130201448A1
• Filed: 01/31/2013
• Published: 08/08/2013
• Est. Priority Date: 02/08/2012
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Nozato, Koji
• Granted Patent: US 8,888,283 B2
• Time in Patent Office: Days
• US Class Current: 351/205
• CPC Class Codes: A61B 3/10 Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
• CPC Class Codes: A61B 3/14 Arrangements specially adapted for eye photography apparatus or arrangements for taking photographs per se G03B

Abstract

To increase the speed of aberration correction, provided is an aberration correction method, including: a step of selecting a first polarized component of reflected light obtained by irradiating an object to be inspected with measuring light; a step of measuring an aberration of the first polarized component; a step of correcting the aberration of the first polarized component by controlling a first aberration correction unit in accordance with a measured value of the aberration of the first polarized component; and a step of correcting, in a case where a value of the aberration corrected in the first aberration correcting step is smaller than a predetermined value, an aberration of a second polarized component of the reflected light, which is different from the first polarized component, by controlling a second aberration correction unit based on a control for the first aberration correction unit in the case.

Claims

1. An aberration correction method, comprising:

a selecting step of selecting a first polarized component of reflected light obtained by irradiating an object to be inspected with measuring light;

a first aberration measuring step of measuring an aberration of the first polarized component;

a first aberration correcting step of correcting the aberration of the first polarized component by controlling a first aberration correction unit in accordance with a measured value of the aberration of the first polarized component; and

a second aberration correcting step of correcting, in a case where a value of the aberration corrected in the first aberration correcting step is smaller than a predetermined value, an aberration of a second polarized component of the reflected light, which is different from the first polarized component, by controlling a second aberration correction unit based on a control for the first aberration correction unit in the case.

2. An aberration correction method according to claim 1, wherein:

the first aberration correcting step is performed when the measured value of the aberration of the first polarized component is equal to or larger than the predetermined value; and

the second aberration correcting step is performed when the measured value of the aberration of the first polarized component is smaller than the predetermined value.

3. An aberration correction method according to claim 1, wherein:

the first aberration measuring step and the first aberration correcting step are performed in a repeated manner; and

the second aberration correcting step is performed when the measured value of the aberration of the first polarized component obtained in the first aberration measuring step is smaller than the predetermined value.

4. An aberration correction method according to claim 1, further comprising a second aberration measuring step of measuring the aberration of the second polarized component of the reflected light obtained by irradiating the object to be inspected with the measuring light,

wherein the second aberration measuring step and the second aberration correcting step are performed in a repeated manner when the measured value of the aberration of the first polarized component obtained in the first aberration measuring step is smaller than the predetermined value.

5. An aberration correction method according to claim 1, further comprising:

a third aberration measuring step of measuring an aberration of the reflected light including the first polarized component and the second polarized component; and

a third aberration correcting step of correcting the aberration of the second polarized component in accordance with a measured value obtained in the third aberration measuring step,

wherein the third aberration measuring step and the third aberration correcting step are performed in a repeated manner after the second aberration correcting step is performed.

6. An aberration correction method according to claim 1, wherein the first polarized component includes a component of the same direction as a polarization direction of the measuring light.

7. An aberration correction method according to claim 1, wherein the first polarized component includes a polarized component having a highest proportion among multiple polarized components included in the reflected light.

8. A storage medium, which stores a program for causing a computer capable of reading the storage medium to execute the aberration correction method according to claim 1.

9. An aberration correction apparatus, comprising:

a selection unit configured to select a first polarized component of reflected light obtained by irradiating an object to be inspected with measuring light;

an aberration measurement unit configured to measure an aberration of the first polarized component;

a first control unit configured to correct the aberration of the first polarized component by controlling a first aberration correction unit in accordance with a measured value of the aberration of the first polarized component; and

a second control unit configured to correct, in a case where a value of the aberration of the first polarized component corrected by the aberration correction unit is smaller than a predetermined value, an aberration of a second polarized component of the reflected light, which is different from the first polarized component, by controlling a second aberration correction unit based on a control for the first aberration correction unit in the case.