Snellen Chart Help (Used Online one)

[Arun]

I think this snellen chart is designed to be viewed from 3 metres. So i don't think you need to multiply it by two.

20/20 is the same 6/6. Just one is in feet and the other is in metres. (I think in theory you would have 3/3 vision but it is the same thing.) But both are great.

[Lynn White]

So it seems your vision is better then JB!

[jayboi2005]

Lynn so 20/20 is good. Im deadly seriouse here, because i don't understand why or how.

[jayuk]

Lynn

May be worth sticking a FAQ on Snelling chart? IF you have the time?
J

[Lynn White]

JB....

20/20 or 6/6 is very good. It means you have "normal" vision and certainly you are WELL within the legal limit for driving.

From what you say, you are a little blurry on that line but the fact you can get it is excellent.

Quite why things appear to have improved I am not quite sure but don't knock it!

I think I need to take up Jay's suggestion here about a FAQ lol...

[Sweet]

Oh please don't panic! You don't have to be so religious with measuring etc if it is only for your benefit. You can put the chart up and stand at a certain place and then take that as your baseline. Then you can assess future ones from that!

Yes the Snellen chart is still on the site. John and i spent twelve hours updating the home page and info yesterday so if you click on the home page link on the top of this page you will see a direct link to it!

Have fun and 20/20 is fantastic!

Sweet X x X

[Andrew MacLean]

20/20 = 6/6

I got that.

I think I also know the formula for converting feet into Metres (thanks to Knight, John, Jayuk, Gareth etc (seriously challenged with sums).

I also understand that 20/40 gives my relative position first and the supposed "normal" second, so that if I were 20/40 I should be able to see at 20 feet what the "normal" sighted person could see twice as far away.

I think I have go9t that, too.

But when some people are given readings like 20/10, does that mean they can see at twenty feet what normal sighted people could only see if they are standing much closer?

I ask because my wife has extraordinary sight.

Do you remember readi9ng about Aristotle? he described microscopic fish that were noly generally visible with the invention of the microscope, and he described the rings of Saturn and Jupiter, having seen them with the naked eye!

Andrew

[Lynn White]

Yes Andrew.. it does mean that. In fact many people with not much refractive error can see 6/5, 6/4 or indeed 6/3

It can be rather depressing even to an optom hehe!

I didn't know what about Aristotle! Have you any references I could go look at?

Lynn

[Andrew MacLean]

Aristotle's references to his own eyesight are scattered through his works. His descriptive work on tiny animals and the wandering stars (planets) can be found mostly in his Metaphysics. Aristotle knew of six wanders in the heavens: Mercury, Venus [by implication, Earth, but never specified, although he ought to hve been aware of the work of Aristarchos who had formulated a theory of the orbital motion of the Earth], Mars, Jupiter and Saturn.

He considered good eyesight to be a "virtue".

As to secondary material I suggest any of the standard biographies. books on the philosophy of Aristotle seem to be mysteriously silent on his sight, perhaps because philosophers fail to recognize the significance of his descriptions.

Andrew

[Lynn White]

Hmmm OK .....

I do find it rather amazing he could see THAT well and wonder if he had some sort of early refractive aids he didn't let on about!