ESTIMATION OF EYESIGHT DIOPTERS?

Question

My eyes are quite short sighted and I haven't had an eye test yet (but I will next Thursday), and I'd really like an estimate of what diopter my eyes are just so that I'm prepared...

When I stretch my arm out, most of it is in focus, but the tips of my fingers are blurred.


When I stand 3 feet away from a 500ml Aquafresh bottle it's too blurred for me to be able to read it. From 1 1/2 feet I can read what it says but the edges are blurred.

I can't read road signs properly even from a couple of metres away and I can't read the school board, not even from the front row.
Any ideas what diopter my eyes could be? Thanks.

Answer 1

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Answer 2

Take something with clear high contrast lettering, set it somewhere and determine how far away you see it in clear, sharp focus (NOT how far you can still read the blurry letters but how far away it is in SHARP focus. Do each eye separately). Measure the distance from your eye to the letters (IN MILLIMETERS!) Divide this number into 1000 and it will give an approximate number of diopters you need. Note that this doesn't take into account astigmatism. For example, if the letters on the Aquafresh bottle are sharp out to 1 foot; 12 in x 25.4mm/in = 304.8mm; dividing 1000 by 304.8 gives about 3.25 diopters (note: for nearsightedness, the numbers are negative as the lenses used are concave).

Answer 3

Think of -1.50 Diopters. othing perfectly clear beyond 2/3 meter.



Optometrist



(1.50 =3/2)



There is more to it than I have suggested.



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If things begin to blur at one half meter, that could mean -2.00 D.



Astigmatism comes into it also.

Remember you have 2 eyes.