The Royal College of Ophthalmologists has recently issued guidelines on the screening of these patients which has made various recommendations. At the present time these recommendations mean that it would be inappropriate to undertake any sort of screening in High street Opticians as it would fall outside of their guidance. They have recommend specific tests which fall outside of GOS and therefore these patients should not be reviewed under a GOS eye test.
Patients requesting such a review should be directed back to their GP and informed that RCO guidelines states they should be referred by their prescriber for a ophthalmologist opinion.
The full RCO document is available here.