The lenses have a power of -2.50 in both eyes (approximately 0.1 vision). I think you can have the lenses replaced at an optician. I used these for about six months while playing volleyball. Comes with a case. SWANS sports glasses with an adjustable strap, round design for a comfortable fit. - Brand: SWANS - Color: Black - Type: Sports glasses - Accessories: Case - Strap: Adjustable - Frame design: Round Thank you for looking.