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Helveston, EM (2005). "Visual training: current status in ophthalmology". American journal of ophthalmology. 140 (5): 903–10. doi:10.1016/j.ajo.2005.06.003. PMID16310470.
Georgievski, Z; Koklanis, K; Fenton, A; Koukouras, I. (2007). "Victorian orthoptists' performance in the photo evaluation of diabetic retinopathy". Clinical & Experimental Ophthalmology. 35 (8): 733–738. doi:10.1111/j.1442-9071.2007.01576.x. PMID17997777.