The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

The person is suffering from myopia and hence needs a concave lens to correct the defect. The lens should be such that an object at infinity must form its image at the far point. Hence, f = −80 cm = −0.8 m. The power of the lens can be obtained as: P = 1/f = 1/(−0.8) = −1.25 D