The protective glasses are designed to wear them over prescriptive glasses. 
"Fitover" glasses offer an excellent splash guard, and the big, clear, glasses on the sides protect from lateral radiation.

• Material:                                         durable nylon
• Lead equivalent value:         0,75 mm (+/- 0,05)
• Weight (frame):                         104g
• Colour:                                             black

This model is available without prescriptive glasses only.