Question

The contact lens prescription for a nearsighted person is –4.00 D and the person has a far point of 22.5 cm. What is the power of the tear layer between the cornea and the lens if the correction is ideal, taking the tear layer into account?

a) 2.00 D
b) 1.50 D
c) 1.25 D
d) 2.50 D

Answer 1

The power of the tear layer between the cornea and the lens in a nearsighted person with a prescription of -4.00 D is 4.00 D.

Step-by-step explanation:

The power of the tear layer between the cornea and the lens can be calculated by subtracting the power of the contact lens from the power of the eye. In this case, the contact lens prescription is -4.00 D. Since the tear layer is between the eye and the lens, the power of the tear layer will be equal to +4.00 D. Therefore, the correct answer is 4.00 D (d) .