The best replacement for refraction is reflection.

The best alternatives to refraction are rated as following:
★★★★★  reflection
★★★★★  diffraction
★★  dispersion
★★  wavelength
★  reflection of light
★  eye exam
★  manifest
★  reflection seismic
★  angle of incidence
  incidence
  light reflection
  refraction
  diffraction light
  reflection waves
  reflection ultrasound

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Speaking about refraction, one probably shouldn't forget about eye exam.

Other search terms related to refraction and their ratings are:
★★★★★ eye exam
retinoscope
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Google Trends

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refraction
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