EPTI wanted to find out whether I was 20/20, 20/40 or w/e
But on the piece of paper the doc gave me, it said
Left eye = -1.25
Right Eye = -1 or -1.35... something like that
What the heck does that mean?
How do eye exams work??
| Blogs > jjun212 |
|
jjun212
Canada2208 Posts
I wanted to find out whether I was 20/20, 20/40 or w/e But on the piece of paper the doc gave me, it said Left eye = -1.25 Right Eye = -1 or -1.35... something like that What the heck does that mean? | ||
Xeofreestyler
Belgium6776 Posts
and the amount is just a way of measuring it if you get around -2 you'll have difficulty distinguishing people's expressions from a distance for example | ||
|
jjun212
Canada2208 Posts
i finally found a yahoo answers page where someone said that my myopia thing can't really tell my exact uncorrected vision. and that i would need to use the eyechart with my optometrist? is that how it works? you judge the 20/20, 20/40 thing using that eye chart thing with the small letters | ||
|
rgfdxm
United States239 Posts
What you got was an eyeglass prescription, which is distinct from visual acuity (you can't convert from one to the other). The reason for this is that correcting your vision is basically a trial and error process of finding lenses that give you the best vision achievable. For a healthy young person with myopia and no other significant problems, usually your prescription will correct your vision to something near 20/20. But, for example, someone with other eye problems (macular degeneration, glaucoma, cataracts), may only be able to get 20/40 or 20/80 vision at best. Your -1.25 prescription doesn't guarantee any particular quality of vision, it is just the best correction they could find for your eyes. Edit: yes, visual acuity is measured using an eye chart. Your prescription is measured by refraction, which also measures visual acuity (it has to in order to be able to compare between different prescriptions to decide which one gives you the best corrected vision). Edit 2: the number itself is a measurement of lens curvature. The farther from zero, the more powerful the lens is. To understand the difference between the + and the - numbers, look up nearsightedness vs farsightedness (myopia vs hyperopia). | ||
|
jjun212
Canada2208 Posts
On May 03 2009 01:59 rgfdxm wrote: 20/20 and 20/40 are measurements of "visual acuity." Your visual acuity was measured, so if you asked you could have found this out, but visual acuity is not very useful for much (except satisfying curiosity). . Thanks for the reply! I get it now; Also; I need to know actually in order to apply to my local police academy. Police officers here need 20/40 uncorrected vision. I thought I could figure out my 20/40 shit by converting my exam paper but guess not. I'll have to return and ask for that chart. Hope they don't charge me too much. | ||
|
rgfdxm
United States239 Posts
| ||
|
R3condite
Korea (South)1541 Posts
haha | ||
|
Navane
Netherlands2757 Posts
I have 3.something And my vision indeed starts to blur around 30 cm. | ||
|
Kennelie
United States2296 Posts
| ||
|
Xeofreestyler
Belgium6776 Posts
you didnt take your contacts out for 3+ years? I occasionally sleep with my contacts because I'm too lazy to take em out, 1 night max though when I wake up my eyes look like those of a chronic stoner lol | ||
|
kOre
Canada3642 Posts
| ||
|
Kennelie
United States2296 Posts
On May 03 2009 04:14 Xeofreestyler wrote: wowow wait you didnt take your contacts out for 3+ years? I occasionally sleep with my contacts because I'm too lazy to take em out, 1 night max though when I wake up my eyes look like those of a chronic stoner lol Yea between the ages of 13-15 I slept with them like everyday for 2 weeks at a time. Eventually I told my eye doctor and he told me not to sleep with them since the contact scratches the eye while sleeping. Since then my eye's get weaker by the year but I rarely sleep with them unless I party too hard and end up sleeping somewhere but even then I make sure I have a case at all my relatives/good friends crib. | ||
|
Durak
Canada3685 Posts
You probably only want to get it if you're 20+ because your eyes can still change quite a bit. One of the clinics will test you and give you specific answers to your situation. It's not very expensive where I live (2-3k) and I know six people who've had lazer eye surgery. They all love it. Personally, I like my glasses because they are stylish but at least the option is there. | ||
micronesia
United States24779 Posts
I'm personally -1.75 diopters in each eye. I only know about how glasses work because I graded a course 'the physics of light' in college so I kinda had to learn the stuff :p | ||
GHOSTCLAW
United States17042 Posts
And I believe that you need to be over 25 to get it, becuase of how your eyecs change. | ||
|
Durak
Canada3685 Posts
On May 03 2009 04:52 GHOSTCLAW wrote: The problem eye surgery is that it tends to reduce your night vision in return for allowing you to see better. Do you have a source for this? I have never heard of that. | ||
|
jjun212
Canada2208 Posts
On May 03 2009 06:38 Durak wrote: Do you have a source for this? I have never heard of that. Its true actually; I was reading about it but the risks outweighed the benefits for me since my eyes are not THAT bad. Also; I won't throw out the idea of Laser Eye surgery though. I am 21 years old and will wait to see the optometrist again and see where I am at. The police academy allows people who have done eye surgery to enter but only after like 3-6 months or something after their surgery because there have been reports that people's results backfired and actually get worse than before. Risks of Laser Eye Surgery - Canadian Gov | ||
|
Durak
Canada3685 Posts
Good luck on becoming a police officer. It's a really tough job. | ||
| ||
