Optical density changes of subretinal hyperreflective material in age-related macular degeneration after switching therapy from ranibizumab to aflibercept

BACKGROUND: Subretinal hyperreflective material (SHRM) is a hyperrefiective material seen on optical coherence tomography (OCT) and located under the retina and above the retinal pigment epithelium. This study aims to examine the effect of SHRM on the functional prognosis of age-related macular degeneration (AMD) patients who switched from intravitreal ranibizumab to intravitreal aflibercept treatment. MATERIALS AND METHODS: This is a retrospective, nonrandomized clinical study. AMD patients meeting the switching criteria underwent a complete ophthalmic examination, including spectral-domain OCT and fundus fluorescein angiography. The best-corrected visual acuity and OCT parameters were measured at the switch and 3, 6, 12, and 24 months after. SHRM(+/−), maximum SHRM thickness, and subjective and objective reflectivity stages of SHRM (grades 1–3) were evaluated. RESULTS: SHRM was observed in 24/48 (50.0%) of eyes at the time of the switch. The differences in maximum SHRM thicknesses were not statistically significant. SHRM's mean subjective reflectivity stages at the switch and subsequent examinations were 2.37, 2.75, 2.75, 2.74, and 2.81; SHRM's objective reflectivity staging also confirmed them. Functional changes after the switch showed a significant VA loss in the SHRM(+) group and significant gain in the SHRM(−) group. CONCLUSION: This study showed that the presence of SHRM and higher optical reflectivity at the switch from ranibizumab to aflibercept caused a poor prognosis after the switch. On the other hand, SHRM(−) patients achieved good functional results after the switch.