Health questions:Visual acuity or whatever its called?

Umm my eyesight is really crap, about -4 in my left eye and -3 in my right. What do negatives mean when it come to eyesight? isnt it usually 20/40 or 20/80 or the like?

Myopia: near- or short-sightedness, Those with myopia see nearby objects clearly but distant objects appear blurred.


Visual acuity scales:
Foot Metre Dec LogMAR
20/200 6/60 0.10 1.00
20/160 6/48 0.13 0.90
20/120 6/36 0.17 0.78
20/100 6/30 0.20 0.70
20/80 6/24 0.25 0.60
20/60 6/18 0.33 0.48
20/50 6/15 0.40 0.40
20/40 6/12 0.50 0.30
20/30 6/9 0.63 0.18
20/25 6/7.5 0.80 0.10
20/20 6/6 1.00 0.00
20/16 6/4.8 1.25 -0.10
20/12 6/3.6 1.67 -0.22
20/10 6/3 2.00 -0.30

The -3 and -4 are measurements called "Diopters" which basically tell the optometrist how strong the lenses in your glasses or contacts need to be to correct your vision to normal, which is 20/20 or better.
The higher the number, the stronger the lens (and the worse your eye is at focusing).
Positive numbers are for correcting farsighted eyes, and negative numbers (like what you have) are for nearsighted eyes.

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