NETRA (aka Near Eye Tool for Refractive Assessment)
Partial description of this company
A low-cost, clip-on eye-piece for mobile phones that mimics and replaces the expensive laser-based Shack-Hartmann wavefront aberrometers to diagnose the most common refractive eye disorders: myopia (nearsightedness), hypermetropia (farsightedness), astigmatism, and presbyopia (age-related visual impairment)
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