Frederick Knezevich

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PURPOSE To determine the agreement among glaucoma specialists in assessing progressive disc changes from photographs in a cohort of patients with glaucomatous visual field loss. DESIGN Retrospective cohort study. METHODS Three glaucoma specialists, masked to chronological sequence, examined pairs of optic disc stereophotographs to determine whether the(More)
BACKGROUND AND OBJECTIVE To report a method to track the pupil in three axes simultaneously prior to imaging the fundus. PATIENTS AND METHODS The system is based on parallax optical alignment to detect the center of the pupil. The system consists of two cameras acquiring pupil images from two distinct directions and an operator-supervised algorithm to(More)
In fundus photography, the task of fine focusing the image is demanding and lack of focus is quite often the cause of suboptimal photographs. The introduction of digital cameras has provided an opportunity to automate the task of focusing. We have developed a software algorithm capable of identifying best focus. The auto-focus (AF) method is based on an(More)
Optic disc photography is used in the management and study of glaucoma. Quality assessment is needed at the time of acquisition and during review. A computerized algorithm for objective quality assessment was developed to mimic the procedure used by human observers. It was tested on film-based images obtained with mydriasis (40 normal and 46 glaucomatous(More)
PURPOSE Retinal thickness (RT) is a useful measurement for describing diseases that affect the thickness of the retina, such as glaucoma. Existing normative data are derived from relatively young individuals; however, glaucoma is most prevalent in older individuals. We therefore studied the RT in older normal individuals. PATIENTS AND METHODS Participants(More)
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