Question

A person is not able to read books clearly.What type of lens should he use in his spectacles and why?Explain the working of that lens. Only for genius and i need suitable answer

Answer 1

Single vision lenses are spectacle lenses that only have one dioptric power throughout the entire lens. They can be used to correct poor vision in either near or far viewing situations, which is why single vision lenses form the basis of both distance spectacles and reading spectacles. As well as offering different powers, these two popular types of spectacles also differ in their appearance: single vision lenses for long-sighted wearers are slightly thicker at the centre of the lens, while single vision lenses for short-sighted wearers are slightly thicker at the edges.

But whatever your prescription, modern ZEISS technology can produce extraordinarily flat and lightweight lenses, even for high prescriptions. And with a choice between four different quality performance tiers, you can pick the solution that best matches your individual vision needs and reading habits.