Question

How does the power of a dry contact lens compare with its power when resting on the tear layer of the eye? Explain.

a) The power is greater when dry.

b) The power is greater when wet.

c) The power remains the same.

d) The power becomes zero.

Answer 1

The power of a dry contact lens is greater compared to when it is resting on the tear layer of the eye.

Step-by-step explanation:

The power of a dry contact lens is greater compared to its power when resting on the tear layer of the eye.

When a contact lens is dry, it becomes stiffer and its shape changes. This change in shape alters the power of the lens, making it more powerful. When the lens is wet and resting on the tear layer of the eye, it conforms to the shape of the cornea and its power remains the same.