Another one of the special eye charts is the Amsler Grid that is simply a square mesh of horizontal and vertical lines looking like this (credit: www.nei.nih.gov):
Focus one eye at the dot in the center
can u see the dot ?
can u see the four corners ?
are all the small squares visible ?
is there any curving of lines ?
Here is the Amsler Grid as it might appear to a person who is afflicted with age-related macular degeneration (credit: www.nei.nih.gov):
Here is another one of these special eye charts facilitating early treatment of diabetic retinopathy study (ETDRS) visual acuity chart (credit: www.nei.nih.gov):
Krishna Eye Centre 102, Maryland Corner, Near H.P. Petrol Pump,
Sion Main Road, Mumbai - 400 022
Phone: +91-22-24071118