The best replacement for diopter is magnification.

The best alternatives to diopter are rated as following:
★★★★★  magnification
★★★  extension tube
★★  focal length
★★  magnifying power
★  20 20
★  20/20
★  visual acuity
★  acuity
★  5 diopter
★  macro lens
  positive diopter
  snellen

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diopter
magnification
extension tube