Check the listing for details. Eye Dominance Correction - Redeye. Condition: New. Listed at 43.41 USD. EYE DOMINANCE CORRECTION - REDEYEKit comprises of a full set of Redeye blister packed.You can use any of the four sizes of Redeye but it is recommended that you start with the 16mm diameter and with practice you should be able to reduce the size of the Redeye being used. Occluding one eye by closing it or blocking it completely, loses depth perception, judgement of speed, field of vision and peripheral vision, Redeye gives you the opportunity to reduce any loss of vision to the bare minimum. DIRECTIONS FOR USE1)Take out 16mm, 12mm, 10mm or 8mm dia Redeye & clean with the cloth provided2) Place the Redeye chosen in the palm of your hand3)Place glasses lens on top4)Even prescription glasses can be used5)Take an 8mm dia Redeye & drop it on the inside of the lens, it will locate centrally6)Put glasses on as normal, at this stage there is no need to have it accurately placed7)Mount the gun as normal8)Adjust to accurately blank out the end of the muzzle9)Then go out and shoot better than you ever have before10)Always clean Redeye with the Cleaning Cloth provided, before returning to its case