I use Accueview Moist daily disposables. I have seven contact lens holders and starting with one pair of lenses I use them for a day and then store them in a holder using Tesco or equivalent saline solution. I continue to use a pair a day until all seven holders have been used and then use pair one again. It helps if you put numbers on the holders with indelible ink. I then continue to rotate the lenses and in this way one pair will last me approximately seven uses. The number of time may vary, sometime a pair may only be used twice and may then feel 'gritty' and have to be discarded because they've been used in dusty conditions (or whatever) but others may last longer than 7 days. I've been doing this for many years now without problem, and the (obvious) secret is absolute cleanliness and disinfecting the holders once they have finished their cycle. In this way a month's supply will last me six to seven nonths.

Has anyone got one of these and is using a 64gb micro SD card? If so how did you format it? Thanks

Welcome - from another Noob.