Handheld magnifiers do not require accommodation and are known as which type of magnifier?

Handheld magnifiers do not require accommodation and are known as which type of magnifier?

• A. Pinhole magnifier
• B. Collimating magnifier
• C. Aspheric magnifier
• D. Fresnel magnifier

Answer: (B)

The key idea is that a magnifier can make a distant (infinity) image so the eye stays relaxed. A collimating magnifier does exactly this: you place the object near the lens’s focal point, and the lens sends out a collimated beam. To the eye, this looks like a magnified image at infinity, so no accommodation is required. That relaxed eye position is what handheld magnifiers leverage, making reading comfortable without needing to focus up close. Other types tweak different aspects—pinhole magnifiers boost depth of field with limited true magnification, aspheric lenses reduce aberrations, and Fresnel magnifiers are thin and lightweight—but they don’t inherently produce an image at infinity the way a collimating magnifier does.

The key idea is that a magnifier can make a distant (infinity) image so the eye stays relaxed. A collimating magnifier does exactly this: you place the object near the lens’s focal point, and the lens sends out a collimated beam. To the eye, this looks like a magnified image at infinity, so no accommodation is required. That relaxed eye position is what handheld magnifiers leverage, making reading comfortable without needing to focus up close. Other types tweak different aspects—pinhole magnifiers boost depth of field with limited true magnification, aspheric lenses reduce aberrations, and Fresnel magnifiers are thin and lightweight—but they don’t inherently produce an image at infinity the way a collimating magnifier does.