1. A method for normalizing an image of an eye among multiple optical coherence tomography (OCT) devices comprising, in the following specified sequence: (a) receiving a first pixmap comprising a first plurality of pixels, wherein the first pixmap represents an image of an eye and the first pixmap has a first sample density; (b) normalizing a sample density; (c) normalizing an amount of noise using a suitable noise reduction technique; (d) applying a histogram matching (HM) process to normalize a distribution of signal amplitudes by: (i) dividing the first pixmap into a first portion and a second portion along a partitioning line; (ii) calculating a first histogram from the first portion of the first pixmap; (iii) mapping the first histogram to a first reference histogram to generate a first mapped histogram; (iv) calculating a second histogram from the second portion of the first pixmap; (v) mapping the second histogram to a second reference histogram to generate a second mapped histogram; and (vi) generating a second pixmap based on a combination of the first mapped histogram and the second mapped histogram; and (e) normalizing a signal quality of the second pixmap; wherein the sequence of steps results in a normalized image of the eye among multiple optical coherence tomography devices.