About 20/20 vision?!
Question:
About 20/20 vision?
1) what is the distance from the Snellen chart where i sat and took the test?
2) is 20/20 applicable to night vision?
3) what happened if i failed the 1st 3 rows of the chart (screen generated by machine)
4) I can't see the 3 row (smallest characters) with my left eye but I can with my right eye, am I still consider 20/20?
5) What can i do to improve my vision? (frankly does looking over the green grass etc help?)
6) Been able to read the newspapers or books at my 'arm length' is this considered normal? Or half of my arm length instead?
7) reference the snellen chart : what does rows 9,10,11 means?
9) by having 20/20 basically at standing 20 feet from an object, what are words (minimum height) I likely to read clearly?
http://en.wikipedia.org/wiki/image:snell...
Answers:
1)Depends on the length of the room. Stereotypically, 20 feet, but you can adjust the size of the letters to reflect the length of any room. Plus you can use mirrors to simulate length.
2)Yes, but night myopia can be an issue. Focusing muscle relaxation, basically, makes you artificially nearsighted.
3)Might need to get your eyes checked.
4)Probably 20/20 left, 20/15 right. The 3 smallest rows are pretty tiny.
5)Probably get glasses or contacts.
6)Yes it is. You should be able to read at both distances, depending on your age.
7)Rows 9,10, and 11 are 20/10, 20/13, and 20/15, respectively.
8)A letter measuring 5 minutes of arc on your retina. Approximately 1.54 cm-ish.