a+ no problem, i will be your patient for you to practice. that's what we used to do here for the dental. as we only need to pay 50% of the regular fee if we were served by the dental student. ^_^
my 66 wears con in the past, but per the eye doctor said, he is getting old, and lack of eye water, unless he do the eye drops every 2-3 hours to keep the moisture, otherwise, easy to have eye infection.
now he only wears con when playing badminton, all other time just "4-eyes froggie"