A low-cost smartphone imaging system could help expand cataract screening in rural and underserved communities by allowing ophthalmologists to assess patients remotely, according to research presented at the 44th Congress of the European Society of Cataract and Refractive Surgeons (ESCRS).
Researchers from Aravind Eye Care System and Johns Hopkins University evaluated a portable attachment that clips onto an Android smartphone and captures magnified images of the anterior eye. The device, which costs less than £150 including the phone, is designed for use by community health workers and can operate alongside a telemedicine app in low-bandwidth environments.
After three hours of training, community health workers used the system to screen 1,093 patients across 19 rural eye camps in Tamil Nadu, India. Images were reviewed remotely by ophthalmologists, whose diagnoses and referral decisions were then compared with those made by ophthalmologists examining the same patients in person.
The strongest agreement was seen in referral decisions, with remote and in-person ophthalmologists reaching the same conclusion in 96% of cases. Agreement was also high for several lens-related diagnoses, including mature cataract at 96%, immature cataract at 85%, pseudophakia at 97%, and clear crystalline lenses at 89%. Community health workers were able to screen each eye in under 2.5 minutes.
Prabhu Krishna Ravilla, of Aravind Eye Hospital, said the findings suggest specialist expertise could be deployed remotely rather than requiring ophthalmologists to travel to every screening location.
“In India and similar countries, the primary model for reaching rural communities has long been the ‘eye camp’ – temporary outreach clinics where ophthalmologists travel from urban hospitals to rural sites on fixed dates,” Ravilla explained. “But this model has serious constraints: it's expensive, logistically complex, entirely dependent on specialist availability and reaches only a fraction of those who need it.”
The approach could be particularly valuable in these areas where geographical barriers and limited specialist availability restrict access to conventional eye examinations. However, the researchers stressed that the system is intended as a screening and triage tool rather than a substitute for comprehensive ophthalmological assessment.
Source: ESCRS Congress.
