Automated fundus imaging system

Abstract

An apparatus for obtaining a retinal image of an eye has a control logic processor for executing a sequence of operations for obtaining the image. A visual target orients the eye of a patient when viewed. An indicator element provides a signal that indicates that the patient is in position. A cornea focus detection section indicates cornea focus, in cooperation with the control logic processor. An alignment actuator aligns the optical path according to a signal obtained from the cornea focus detection section. A retina focus detection section detects retina focus in cooperation with the control logic processor. A focusing actuator is controlled by instructions from the control logic processor according to a signal obtained from the retina focus detection section. An image capture light source is energized by the control logic processor for illuminating the retina.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This is a divisional of commonly assigned application U.S. Ser. No. 11 / 196,824, entitled “AUTOMATED FUNDUS IMAGING SYSTEM”, filed on Aug. 3, 2005 in the names of Liang et al, and which is assigned to the assignee of this application.FIELD OF THE INVENTION [0002] This invention generally relates to electronic imaging apparatus for fundus imaging and more particularly relates to an improved fundus imaging apparatus for automated imaging without operator intervention. BACKGROUND OF THE INVENTION [0003] Fundus camera imaging is acknowledged to be an important diagnostic tool for detection of various conditions affecting the eye, including diabetic retinopathy and macular degeneration. Various embodiments of fundus imaging apparatus are disclosed, for example in U.S. Pat. Nos. 5,713,047 (Kohayakawa); 5,943,116 (Zeimer); 5,572,266 (Ohtsuka); 4,838,680 (Nunokawa); 6,546,198 (Ohtsuka); and 6,636,696 (Saito). [0004] While conventional fundus ima...

AI Technical Summary

Benefits of technology

"The present invention is an apparatus for obtaining a retinal image from an eye. It includes a control logic processor for executing a sequence of operations for obtaining the image, a visual target for orienting the eye of a patient, an indicator element for providing a signal that indicates that the patient is in position for imaging, a cornea focus detection section for providing an indication of cornea focus, an alignment actuator for aligning the optical path of the apparatus according to a signal obtained from the cornea focus detection section, a retina focus detection section for detecting retina focus in cooperation with the control logic processor, and a focusing actuator controlled by instructions from the control logic processor according to a signal obtained from the retina focus detection section. The apparatus is designed to be automated and does not require operator intervention for normal operation. It allows the patient to have an enhanced sense of control over the imaging process without requiring operational expertise or training of the patient."

Problems solved by technology

While conventional fundus imaging apparatus require manual operation, there has been considerable effort expended toward automating specific functions of these imaging apparatus.

While these patents attest to continuous improvements in fundus camera design, there are still significant hurdles to widespread acceptance and usability of these devices.

Among disadvantages noted with current apparatus are relative complexity of operation.

One inherent problem relates to the operator learning curve.

While a number of these systems offer ease of operation, they still require some amount of practice.

However, only a small percentage of patients in the PCP environment will require this type of screening.

Operating this equipment once or twice a day may not give an operator enough practice to achieve a level of mastery of the apparatus.

Moreover, problems of staff scheduling and turnover may make it impractical for a facility to have only a single staff member trained to use this apparatus.

Thus, even though newer fundus imaging apparatus may be easier to operate, there are inherent barriers to taking advantage of easier operation.

In order to be economical, classroom or individual training is impractical.

Even using on-screen prompts, it would be very difficult to provide effective interactive operator assistance during imaging.

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