The most frequent impediments to acquiring good OCT images are ocular movement, media opacity, and an uncooperative patient.
Images taken through miotic pupils are generally good. In rare cases, dilation of the pupils is necessary.
A normal lacrimal film or good corneal hydration with artificial tears is necessary.
It is possible to obtain images when early cataracts are present or when other opacities obstruct light rays. However, these conditions may interfere with scan quality.