Here, we aim to test the accuracy and validate the MLSDT using 9 shapes (instead of 3 shapes) as a reliable, standardized and efficient test of functional vision in STGD and GA patients with impaired vision. This includes evaluation of the performance (retest variability and repeatability) of the test(s) based on patients' visual acuity. Furthermore, we will explore descriptive relationships between MLSDT with best-corrected visual acuity (BCVA) using the Early Treatment Diabetic Retinopathy Study ETDRS) eye chart.
