The Arclight has been shown to be as effective as traditional more expensive direct ophthalmoscopes. Combined with a good examination technique the diagnostic potential of the device can be maximised. This can allow a user who has been well taught and practised regularly to be able to diagnose cataract, glaucoma, diabetic retinopathy, macular degeneration and retinal detachment. When attached to a mobile phone camera video of clinical findings can be acquired, stored and transferred for second opinions where there is uncertainty.