Definition: 'Night Myopia'
night myopiaType: Term
1. in dark adaptation the eye becomes more sensitive to shorter wavelengths (Purkinje shift), and visual acuity depends on parafoveal blue cones. Shorter wavelengths come into focus in front of the retina, and this chromatic aberration accounts for some of the relative myopia that a normal eye experiences at night; much of the remainder is due to an increase in accommodative tone in the dark.
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