Better Vision with Squinting
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Hello! I am an optometry student having difficult with this question. is it possible you could help me understand this ... what is the optimal size of a pinhole used to estimate acuity? why? answer: 1.0mm; smaller will not sufficiently increase depth of focus, leaving refractive error, while larger will result in significant diffraction. Thank you i really appreciate it.
ifernandez521 2 months ago in playlist More videos from justinsparhawk
I would add the technical explanation is called "depth of field", or "depth of focus". The amount you can "clear your Snellen" can be on the order of 1 diopter -- by my testing.
otissumnerbrown 5 months ago
thanks for explaining , i always had this question in my mind - u answered it :))
kap0000007 5 months ago
I would have drawn lines coming in from different angles like a sunray diagram. The middle lines go straight to the retina and don't require refraction. By squinting, you're cutting out the lines that come at angles and need refraction.
HappyHag 2 years ago