Which type of magnifier requires the user to use their accommodation?

Which type of magnifier requires the user to use their accommodation?

• A. Stand magnifier
• B. Handheld magnifier
• C. Collimating magnifier
• D. Telescopic magnifier

Answer: (A)

Accommodation demand from a magnifier depends on where the enlarged image is formed relative to the eye. If the magnified image is at a near distance, the eye must converge and focus to see it clearly, so accommodation is required. A stand magnifier places a page under a fixed lens on a stand and you look through the lens to view a magnified image that sits close to the eye. That near-positioned image means the eye has to accommodate to keep it in sharp focus, which is why this type requires accommodation. The other designs are arranged to minimize that demand. A collimating magnifier is designed to send light so the magnified image appears at infinity, allowing the eye to view with relaxed accommodation. Handheld and telescopic magnifiers can be used in ways that provide viewing at farther distances or in a manner that doesn’t force near-point accommodation as consistently as a stand magnifier.

Accommodation demand from a magnifier depends on where the enlarged image is formed relative to the eye. If the magnified image is at a near distance, the eye must converge and focus to see it clearly, so accommodation is required.

A stand magnifier places a page under a fixed lens on a stand and you look through the lens to view a magnified image that sits close to the eye. That near-positioned image means the eye has to accommodate to keep it in sharp focus, which is why this type requires accommodation.

The other designs are arranged to minimize that demand. A collimating magnifier is designed to send light so the magnified image appears at infinity, allowing the eye to view with relaxed accommodation. Handheld and telescopic magnifiers can be used in ways that provide viewing at farther distances or in a manner that doesn’t force near-point accommodation as consistently as a stand magnifier.