What does a "plus" sign in a prescription indicate?

• A. Lenses for presbyopia
• B. Lenses for correcting astigmatism
• C. Lenses for correcting farsightedness
• D. Lenses for myopia

Answer: (C)

A "plus" sign in a prescription indicates lenses for correcting farsightedness, also known as hyperopia. This is because the plus sign denotes that the person has a need for convex lenses, which help in focusing light properly onto the retina for individuals who struggle to see nearby objects clearly.

In contrast, individuals with farsightedness typically find objects that are closer to be more challenging to focus on due to the shape of their eyeball or the way light enters their eye. Convex lenses, marked with a plus sign, help to bend the light rays inward, making it easier for the eyes to focus on close objects.

Understanding this is essential for providing the right lenses to patients, as using a lens with the wrong prescription can lead to discomfort and vision problems.