Cirrus HD-OCT Measurement of Area of Increased Light Penetration Under the Retinal Pigment Epithelium (RPE)

Specific Objectives:

1. To compare Cirrus HD-OCT automated measurements of the illumination area under the RPE
to expert manual measurements of areas of hypofluorescence typical of geographic
atrophy in fundus autofluorescence (FAF) images.

2. To describe the differences and similarities between Cirrus HD-OCT and fundus
autofluorescence images of subjects with geographic atrophy secondary to dry
age-related macular degeneration (AMD).

3. To determine the clinical factors that affect the Cirrus HD-OCT automated measurements
of the illumination area under the RPE.

Inclusion Criteria:

- Males or females 50 years of age and older diagnosed to have advanced dry AMD with
geographic atrophy.

- Geographic atrophy lesions should:

- Not be greater than 5 mm at the widest diameter. The entire lesion(s) should fit
into the 6x6 mm scan area of the Cirrus HD-OCT.

- Not be smaller than 1.25 mm2.

- Not be confluent with peri-papillary atrophy.

- Not be combined with other lesions such as CNVs.

- Able and willing to make the required study visit.

- Able and willing to give consent and follow study instructions.

Exclusion Criteria:

- History of retinal surgery, laser photocoagulation, and/or radiation therapy to the
eye.

- Evidence of other retinal diseases of the eye, including wet AMD, diabetic
retinopathy, diabetic macular edema, or significant vitreomacular traction upon
dilated examination, or upon evaluation of retinal photos.

- Thick media opacity or inability to fixate that precludes obtaining acceptable scans.

- Concomitant use of hydrochloroquine and chloroquine.

- Unable to make the required study visit.

- Unable to give consent or follow study instructions.