Difference between revisions of Optics related math
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m (add refs section) |
m (→Visual acuity equation: need to multipy rather than divide by 60 to convert degrees to arcminutes. I think it was just misinterpreting the original on the blog page.) |
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==Visual acuity equation== | ==Visual acuity equation== | ||
<math>(\frac{font\ height}{distance\ to\ sign})(\frac{180}{ | <math>(\frac{font\ height}{distance\ to\ sign})(\frac{180}{pi}) \times 60 = arcminutes = a</math> | ||
Note: 5Arcminutes = 20/20 | Note: 5Arcminutes = 20/20 | ||
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With text that we are familiar the brain may clear up that text more than our vision actually operates at.<ref>{{cite jake|https://endmyopia.org/use-math-to-turn-any-text-into-your-own-impromptu-eyechart/}}</ref> | With text that we are familiar the brain may clear up that text more than our vision actually operates at.<ref>{{cite jake|https://endmyopia.org/use-math-to-turn-any-text-into-your-own-impromptu-eyechart/}}</ref> | ||
==Average axial length accomodation/rate of change== | ==Average axial length accomodation/rate of change== | ||
<math>typical\ emmetropic\ eye = 25mm = 25,000\ microns</math> | <math>typical\ emmetropic\ eye = 25mm = 25,000\ microns</math> |
Revision as of 09:24, 21 June 2020
Here's a page with maths related to diopters and glasses.
You don't really need to know any of this stuff to improve your eyesight, but it's good to know for deeper understanding
Diopters are inverse meters
See Also Diopters
See Also cm Measurement
Remember that 100cm = 1m.
conversely
Point of refraction
See also Refraction
(meters)
(meters)
(meters)
(diopters)
Visual acuity equation
Note: 5Arcminutes = 20/20
Set up proportion:
Visual acuity (mm/metres)
Visual acuity (in/feet)
With text that we are familiar the brain may clear up that text more than our vision actually operates at.[1]
Average axial length accomodation/rate of change
If someone with typical eyes wanted to adapt say 20/20 to .25 less normalized within 3-4 months would need to decrease axial length 0.083mm about 0.92microns/day - 0.69microns/day average Credit: Mark Podowski
Converting from Glasses to Contact Lens Prescription or vice-versa
References
- ↑ The EndMyopia Blog, https://endmyopia.org/use-math-to-turn-any-text-into-your-own-impromptu-eyechart/