Quantification of cystoid changes in diabetic maculopathy

Area of Science:

• Ophthalmology
• Medical Imaging
• Diabetic Retinopathy

Background:

• Diabetic macular edema (DME) with cystoid formation presents challenges in quantifying disease extent.
• Accurate measurement is crucial for assessing visual acuity impact and treatment efficacy.

Purpose of the Study:

• To introduce reliable measurements for cystoid macular edema extent.
• To quantify cyst area and number in DME patients.
• To determine the relationship between cystoid formation and visual acuity.

Main Methods:

• Utilized fluorescein angiography (FA) with a scanning laser ophthalmoscope for detailed imaging.
• Employed digital image analysis for quantifying cyst area, cyst number, and foveal avascular zone (FAZ).
• Two independent observers performed estimations within the central 2.5 degrees of the fovea.

Main Results:

• Twenty-three diabetic patients with macular cysts were analyzed.
• Mean cyst area was 0.315 ± 0.241 mm², with 1-7 cysts per patient.
• Both cyst area (r²=0.61) and cyst number (r²=0.48) significantly correlated with visual acuity (P<0.01).
• FAZ measurements did not show a significant correlation with visual acuity.

Conclusions:

• Fluorescein angiography provides reproducible quantification of macular cyst extent.
• The number and area of macular cysts significantly correlate with visual acuity.
• These quantitative measures offer objective criteria for visual prognosis and therapy outcome evaluation in DME.