A magnifying lamp commonly used by estheticians typically has what diopter rating?

• A. 2 diopters
• B. 5 diopters
• C. 8 diopters
• D. 10 diopters

Answer: (B)

Diopter rating tells you how strong a lens is. Higher diopters mean more magnification and a shorter working distance. In esthetics, a five-diopter lens is a common choice because it gives enough magnification to see fine skin details—pores, texture, and subtle changes—while keeping the lamp at a comfortable distance and providing a broad, well-lit view. This roughly corresponds to a focal length of about 20 cm, which lets you inspect closely without crowding the area or straining the eyes. A lower power would not reveal enough detail, while a higher power would push the lens too close and make working distance awkward and potentially tiring.