Introduction of contact lens

 As a Department of Optometry's student, I want to talk about some basic is not introduction with contact lens.
1.Contact lens have soft type and hard type.
2.Accroding to different material, there are different water content and different oxygen permeability rate.
3.It is not better in higher water content, the most important one is oxygen permeability rate.
4.Every one should according to their own eye size and cornea radian to choose their own contact lens.