People with diabetes are at high risk of diabetic eye disease such as diabetic retinopathy (DR) which is the most commoncause of vision loss. It is caused by damage to the small blood vessels in the retina. If untreated, it may result in varyingdegrees of vision loss and even blindness. Since DR may cause no symptoms or only mild problems in its early stages, adiabetic person must have regular annual eye exams. During eye exams, doctors often image the retina using funduscameras for diagnosis. However, fundus cameras are too large and heavy to be transported easily and too costly to bepurchased by every health clinic. Therefore, there is a growing demand for small, portable, and inexpensive retinal imagingsystems to perform fast DR screening.Recent technological developments have enabled the use of smartphones as biomedical imaging devices. The smartphonebasedportable retinal imaging systems available on the market are used only to capture and save retinal images; they donot analyze them using any image processing techniques. In this paper, we investigated the smartphone-based portableophthalmoscope systems available on the market and compared their field of view to determine if they are suitable for DRscreening during a general health screening. Based on the results, iNview retinal imaging system has the largest field ofview and better image quality compared with iExaminer, D-Eye, Peek Retina retinal imaging systems.
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