I. Introduction
Optical Coherence Tomography (OCT) has become a key diagnostic imaging technique for the diagnosis of retinal diseases [1]. The ability to visualize the internal structure of retina provides a qualitative and quantitative assessment of morphological changes associated with underlying diseases [2]. Measurements derived from OCT are considered to be very important markers in evaluating treatment response and disease progression in clinical practice and in clinical trials [3], [4]. In particular, retinal thickness or central macular thickness (CMT) measured in OCT has been shown to be associated with pathological changes and treatment outcomes for various ocular diseases [5]–[7].