If a plus power lens is moved away from the eye, how does it feel?

If a plus power lens is moved away from the eye, how does it feel?

• A. Weaker
• B. Stronger
• C. Unchanged
• D. More intense

Answer: (B)

When a plus power lens is moved away from the eye, the effective power of the lens is perceived as weaker. This is primarily because the distance between the lens and the object being viewed increases. A plus lens is designed to converge light rays to assist individuals with hyperopia (farsightedness). When the lens is further away from the eye, the distance at which it can converge light is greater, which reduces the lens's ability to provide the necessary plus power at the original viewing distance. Pushing the lens away causes the image to be perceived as less magnified, as the effective focal length of the lens increases. Thus, the plus lens produces less convergence on the incoming light rays, making tasks such as reading more difficult if one were to move the lens further away from the eye, as would be experienced by someone trying to see clearly through the lens at a closer object distance. This results in the lens feeling weaker rather than stronger or unchanged.

When a plus power lens is moved away from the eye, the effective power of the lens is perceived as weaker. This is primarily because the distance between the lens and the object being viewed increases. A plus lens is designed to converge light rays to assist individuals with hyperopia (farsightedness). When the lens is further away from the eye, the distance at which it can converge light is greater, which reduces the lens's ability to provide the necessary plus power at the original viewing distance.

Pushing the lens away causes the image to be perceived as less magnified, as the effective focal length of the lens increases. Thus, the plus lens produces less convergence on the incoming light rays, making tasks such as reading more difficult if one were to move the lens further away from the eye, as would be experienced by someone trying to see clearly through the lens at a closer object distance. This results in the lens feeling weaker rather than stronger or unchanged.