Introduction
The purpose of the study is to characterize the rate of progression of geographic atrophy (GA) areas in patients with age-related macular degeneration (AMD) with subclinical angioid streaks (AS), compared to patients with AMD without subclinical AS.
Methods
This is a retrospective, longitudinal, case–control study. Among a cohort of patients with AMD, we selected patients with GA with subclinical AS and followed them for a 2-year follow-up. An age- and sex-matched control group with GA secondary to AMD without subclinical AS was selected. Demographics and differences in the GA progression between the two groups were analyzed.
Results
Among 60 eyes of 60 patients affected by GA secondary to AMD, 20 eyes of 20 patients (mean age 82 ± 5 years old) were included in the subclinical AS group, whereas 40 eyes of 40 patients (mean age 79 ± 6 years old, p = 0.077) were in the control group.
All 20 eyes of subclinical AS group showed reticular pseudodrusen at the baseline compared to 73% of patients without AS (p = 0.002). In the subclinical AS group, 90% of eyes showed peripapillary atrophy in comparison to 63% in the control group (p = 0.026). Subclinical AS eyes showed a significantly lower subfoveal choroidal thickness in comparison to the control group (124 ± 60 μm vs. 161 ± 84 μm, respectively, p = 0.043). At 2-year follow-up, the rate of progression was higher in the patients with subclinical AS; the yearly growth rate was 0.41 ± 0.17 mm/year after the square root transformation in the subclinical AS group, in comparison to 0.32 ± 0.14 mm/year in the control group (p = 0.017).
Conclusions
Patients with subclinical AS showed a more aggressive phenotype of GA in comparison to AMD patients without subclinical AS, characterized by a higher rate of progression of GA areas during a 2-year follow-up.
