Difference between revisions of Guide:How to choose eyeglasses for Endmyopia journey
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{| class="wikitable" | {| class="wikitable" | ||
! Distance !! Under-correction!! Clear vision distance !! Distance vision visual acuity | ! Distance !! Under-correction from full correction !! Clear vision distance !! Distance vision visual acuity | ||
|- | |- | ||
| By far in normal use || -0.25D^ || Between 2.67m and 8.00m || 20/25 | | By far in normal use || -0.25D^ || Between 2.67m and 8.00m || 20/25 | ||
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{{resize|80%|^Ideal first Normalized}} | {{resize|80%|^Ideal first Normalized}} | ||
===2. Full Correction=== | |||
The [[20/20 correction]] (full correction rounded to a step of 0.25 D lower) is a correction that you normally get from a licensed optician, who corrects your eyesight to a degree ofvisual acuity only one emmetropic person (or "normal vision") reached on as nellen chart, putting your blur horizon within 0.25 D of the diagram. | |||
'''When to use Full Correction?''' From afar when clear vision is needed (when driving or unreadable small print with [[Normalized]] on classroom) | |||
===3. Differentials^^ for computer=== | |||
The [[Differentials]] (jargon) (near vision, computer glasses or differentials) are glasses or lenses with reduced power for a [[close-up]] work. The differentials just allow you to clearly see what you are working on. | |||
{| class="wikitable" | |||
! Distance between your eyes and you computer !! Under-correction from full correction | |||
|- | |||
| Between 72.8cm and 88.8cm || -1.25D | |||
|- | |||
| Between 61.5cm and 72.8cm || -1.50D | |||
|- | |||
| Between 53.3cm and 61.5cm || -1.75D | |||
|- | |||
| Between 47cm and 53.3cm || -2.00D | |||
|} | |||
Revision as of 09:23, 9 October 2022
1. Normalized
The Normalized (normal or distance use) are glasses slightly reduced from a 20/20 correction. The Normalized are used with the distance vision as main Stimulus to improve eyesight.
| Distance | Under-correction from full correction | Clear vision distance | Distance vision visual acuity |
|---|---|---|---|
| By far in normal use | -0.25D^ | Between 2.67m and 8.00m | 20/25 |
| By far in normal use | -0.50D^ | Between 1.60m and 2.67m | 20/30 |
| By far in normal use | -0.75D | Between 1.14m and 1.60m | 20/40 |
| By far in normal use | -1.00D | Between 0.89m and 1.14m | 20/50 |
^Ideal first Normalized
2. Full Correction
The 20/20 correction (full correction rounded to a step of 0.25 D lower) is a correction that you normally get from a licensed optician, who corrects your eyesight to a degree ofvisual acuity only one emmetropic person (or "normal vision") reached on as nellen chart, putting your blur horizon within 0.25 D of the diagram.
When to use Full Correction? From afar when clear vision is needed (when driving or unreadable small print with Normalized on classroom)
3. Differentials^^ for computer
The Differentials (jargon) (near vision, computer glasses or differentials) are glasses or lenses with reduced power for a close-up work. The differentials just allow you to clearly see what you are working on.
| Distance between your eyes and you computer | Under-correction from full correction |
|---|---|
| Between 72.8cm and 88.8cm | -1.25D |
| Between 61.5cm and 72.8cm | -1.50D |
| Between 53.3cm and 61.5cm | -1.75D |
| Between 47cm and 53.3cm | -2.00D |