The effects of vision impairment as indicated by ( @ ) near visual acuity , ( @ ) contrast sensitivity , ( @ ) self-reported cataracts and ( @ ) self-reported other eye conditions ( e.g. , glaucoma , macular degeneration , diabetic retinopathy , optic neuritis , and retinopathy ) among participants randomised to either SPT or a social - and computer-contact control group was assessed .