The water content of these UV contact lenses can reach up to 45%, hence it is very comfortable to wear. The markings present at the backside of the cards (that cannot be detected by the naked eyes) can be viewed after you wear these contact lenses or glasses. The lenses use the most advanced and latest technology available till date for this particular product. The markings which depict the number and suite of the card are present at the rear end of each card. It is suitable for every kind of card game like Blackjack, poker, teen patti, etc.