What is a 1.57 mid index single vision lens?

Answer 1

1.57 mid index single vision lenses means that the lens is thinner than standard plastic lenses. It is not the thinnest possible, nor is it impact resistant like Trivex 1.53 mid index lenses, or polycarbonate. It will be thinner than either of those materials.

Single vision means that there is one range of vision. If a bifocal lens is not prescribed, then this is what the vision is. When the prescription is a bifocal prescription, then either distance only or reading only must be chosen.

Answer 2

A 1.57 mid index lens is a type of lens material that falls in between standard plastic (1.50 index) and high index (1.60 and above) lenses in terms of thickness and weight. It is a good option for those looking for a balance between affordability and optical performance in single vision prescriptions.