Correcting contact lens
The approach to the ideal lens shape with better night vision
Retina is the approach to the ideal lens shape. With the right Retina inside and the right Retina outside, a lens is constructed with only an extremely minimal deterioration in strength. To calculate the correct Retina (determined by the cornea), simple lens power formulas are not sufficient. For the Retinal lenses, the correct outer ellipse is therefore determined in a different way.