Eye Charts

16 Pages·2013·0.23 MB·English

Eye Charts
If you want to improve your vision with natural vision improvement techniques, such as the
Bates Method, you need an eye chart. With an eye chart, you can perform various eye
exercises, and, of course, an eye chart provides an objective way for you to see your progress
as you improve your visual fitness. As you experiment with various vision improvement
techniques, the eye chart can help you decide which exercises work and which ones don't
work for you.
Read Clearly Naturally
"Vision Without Glasses" program Got Presbyopia
Completely Natural Way To Improve Your (farsighted)? Want to read
Eyesight. Guaranteed! small print without your
VisionWithoutGlasses.com glasses?
JanetGoodrichMethod.com
Check out the eyechart download section for free eye charts, ready to print out (or use on
screen) and use in measuring and training various aspects of vision; or, follow the instructions
on how to make your own eye chart!
SNELLEN EYE CHART
The chart is usually read while standing at a distance of 20 feet. Acuity is represented as a
fraction, with the distance at which you are standing being the numerator (top part of
fraction), and the normal maximum legible viewing distance ("Distance" on the chart above)
as the denominator (bottom of fraction). So if, at 20 feet, you can read the letters on the row
marked "40", this means you have visual acuity of 20/40 or better: 1/2 normal. From 10 feet,
if the smallest letters you could read were on the "40" line, this would give you an acuity of
10/40: 1/4 normal. If you are nearsighted, your vision will become more normal the closer
you stand to the chart.
How do you use your eye chart? Tell us about it on the mailing list!
Free eye charts to download!
• Classic Eye Chart: Joel Schneider's 3-page Snellen Chart plus near vision testing
card
• Modern Standard: ETDRS charts based on those provided on the National Eye
Institute's charts page. The following charts have correctly-labelled lines from 40ft to
2ft suitable for printing on letter sized paper, and feature vector graphics for a sharper
image (unlike the maximum 300dpi, not-to-scale charts provided by the N.E.I.).
o Chart R
o Chart 1
o Chart 2
• Interactive Eye Chart: Alejandro Saksida's Flash-based Ultimate Random
Snellen Chart generator, version 3.1 (updated January 12, 2006):
o Read Instructions.
________________________________________________
/@\ . , ' \
|\/___,__________________________________________/
| 12 January, 2006 . ' ' |
| |
| The Ultimate |
| Random Snellen Chart Generator |
| v3.1 |
| " for Macromedia Flash |
| Player |
| |
|
|
|, . . -by Alejandro Saksida-|
| ' ([email protected])|
| |
| Latest versions can always be found at |
| http://www.i-see.org/random_snellen |
|______________________________________________|_
| @_\ ' ' \
\__/____________________'_______________________/
__________________________________________
| |_
| Index: | |
| ------ | |
| | |
| - What's new? | |
| - Introduction | |
| - Use | |
| - Some PRETTY IMPORTANT hints | |
| - Wanna print? | |
| - Final comments | |
| - History | |
| - Rights | |
|__________________________________________| |
|___________________________________________|
__________________
/ \
| What's new? : |\
\__________________/ |
\_________________/
New to v3.1
-Bug fix! The printing function printed the Contrast dialog.
Oops... Luckily Jim Tackett reported this bug and now it's fixed.
-Changed the image of the printing, so that no one gets confused
anymore about the settings.
New to v3
-Recoded everything, optimized code and redesigned completely. Now
it looks better but it's smaller :D
-Added contrast button. Now you can change gradually the color of
the characters and the background for contrast sensitivity and night vision
training.
-Remade printing setting, now you can choose wether to print rulers
or not and it reminds you to change the settings for it to work properly
-Remade the animals pictures because they used to overlap and
dissappear. Now they work perfectly
-Added support for 1024x768 screen.
-Interface and rulers fade to dissappear when not used to avoid
them from distracting you
-If you point a line, a red underline appears, if you click it, the
characters on that line dissappear. Click again to make them reappear.
-Completely redesigned interface. It looks better and it's a far
more solid.
-The settings of each section are sticky. That is, they don't
switch back when you change section.
-The intro can be skipped now.
New to v2.5
-Renamed Kay Pictures to Pictures (more correct use)
-Added two more possibilities in the Pictures: Food and Animals
(now Animals is
as default), there's a little combobox at the bottom from which
you can choose the
mode you need.
-Fixed the clipping of the Symbols in the Pictures. Yay!
New to V2.1
-Removed the ruler of the printed version (Unnecesarily
distracting, check the
"Wanna print?" section)
-Made the Tumbling Es square so no height guess is possible.
-There were no 'Z's (!!??). Added 'Z's.
-There were 'W's. Those are forbidden in a Snellen Chart (some
rule). Erradicated
'W's. ('M's have the same trouble, but they were erradicated from
the 2.0 on).
-Fixed a bit the Pictures (some of them got cutted by the right
side, and still
happens regretably.. I don't know how to fix this, so if anybody
has an idea...)
New to V2.0
This version has a lot of updates, I'll list them below:
- It's now possible to print
- Red underlines can be placed in any chosen row by just clicking
on it
- 8 position tumbling Es were eliminated to be replaced by Cs
(Landolt Cs)
- A new cool intro and loading screen
- A much better interface
- Fixed the low performance bug of the last version (?!)
- Totally reprogrammed for Flash MX!(faster, printable, less sized
player download, etc.)
- Landolt Cs chart added
- Pictures chart added
- Renamed Randomly Oriented Es to Tumbling Es :)
___________________
/ \
| Introduction: |\
\___________________/ |
\__________________/
A Snellen Card is something that gets old after some time if you
have an
specific one. This starts to become a problem when you remember
every
line without even looking at it. That happened to me more
than once,
limitating and falsifying my advance, that's why I've created this
random
letter Snellen chart.
This chart not only generates random snellen charts but also
Landolt C's,
Tumbling 'E's and Pictures in different flavors.
Enough introduction, time for some handy details.
________________
/ \
| Use: |\
\________________/ |
\_______________/
First, it's very probable that you need not much documentation
because the
"program" is very WYSIWYG (dumbass-proof) and however you
(closely for
sure) know how to use a Snellen card. This version anyway has
got some
important changes in the interface so I'm anyway going to explain
briefly
the use of this program and, later, give you some PRETTY
IMPORTANT
and useful HINTS about this program. But let's go first for
the use
instructions:
Use (both on-line and off-line):
Load (need Flash player for this, you can download it from
Macromedia's site
or just try accessing the Snellen card, if you don't have the
plug-in,
automatically it'll take you where you can download the Flash
Player),
General to all tabs interface usage:
Randomize button: cycles the charts through infinite random
combinations.
Pointing at any row: displays a red underline over the pointed
character line.
Click to make that character line dissappear. Click again to make
it reappear.
Print button: Displays the print dialog. There's a checkbox that
allows you to
print or not the rulers to the left. After clicking OK, it shows a
procedure to do
with the next window. Please follow it, although, unlike the
previous version,
not doing so shouldn't make a complete disaster.
Contrast button: Displays the print dialog. Drag the tuners to
adjust the blackness
or whiteness of the background and the characters. You'll preview
it on the back,
but if you don't like the results, just cancel.
Sections tabs: Click on each to change the type of chart to display
Sections specific interface usage:
Snellen:
Rounded Font checkbox: it's checked by default but if you uncheck
it, you see the Snellen
chart in a more square font, this is, Arial. If you check it
again, it'll go back
to the Courier font.
Pictures:
Combobox at the top left: Change this between symbols, food and
animals figure sets.
Off-line use:
Jjust unzip (if you're reading this, probably this step
has already been done) the file somewhere on your disk, go there
and open
the html with your favourite Browser (with the "Work
Disconnected" kind
button checked if it isn't already) and you're done!
_______________________________________
/ \
| Some PRETTY IMPORTANT hints |\
\______________________________________/ |
\_____________________________________/
I bet most of you won't read all these hints. I don't wanna
bore you, so
here are their importance levels:
[1]: MUST read
{2}: Important
(3): Just a hint
[1] If you have Internet Explorer, use the Full Screen (F11 key)
while using
it. If you don't, see if there are any Full Screen button
somewhere, if
there isn't, consider having IE because it'll drive you mad to
use it on
a smaller screen.
[1] If you have a 14" monitor, use it at 800x600 or 1024x768 for
real size reference.
I've made it that way mostly because it was originally
designed for
personal use (and left it because it's the most common
monitor and
resolution). Also, I've been told that it's almost correct in
1024x768 on 800x600 mode
in a 16" monitor.
{2} Else, if you don't have a 14/16" monitor or you cannot use
the 800x600
/ 1024x768 resolution, not everything is lost, there is a
way to get
ahead: first, measure the big first letter (initially an E)
in inches,
and, if you use to step at 20ft (*), multiply that number for
17.391 and
that will give you the distance you should stand at measured
in feet.
If you use to stand at 10 ft (*) (mainly for lack of vast space
which is
my case and, I imagine of many others) the multiplier to use
would be
8.695 (see it's the half as 10 ft is the half of 20 ft).
I've been
testing it, sizing it at distance as good as I could in two
different
scales and everything seems to be in order.
(*): Of couse, the choice of the distance will be fixed to
your
ultimate objective, if you choose to stand at 20 ft, your
objec-
tive will be the 6th line, otherwise, if you choose to stand
at
10 ft, your ultimate objective will be the 8th line and so
on
{2} If you have a glass protector (those for radiation that
darken the
screen), take it away while reading. Also the brightness and
contrast of
the monitor will affect, but that depends too much on the
monitor, see
what fits better to you but I recommend you to put the
monitor on the
max contrast and a reasonable brightness.
(3) If you do this daily and take note of what you see to
compare it when
you're nearer, I mean, you stand far, guess what the whole
Snellen chart
says, taking note of that "prediction" for later comparation
when you're
nearer to the screen (that's the way I do it), it's VERY
useful to have
one of those toys called "Magic Slate" or like, you know,
those ones
that you can draw and erase and draw again. It'll become a
good partner
if you get accostummed to use one of them.
(3) Try to avoid looking at the screen after clicking the
Randomize
button or you will be cheating ;)
(3) If you stand at 10 ft, your last objective will be the 8th
line, that
may be a problem because that line is a bit beyond the
reach of the
screen (at least in the common monitor/res.). There are two
solutions
for this kind of problem: go back to the computer to scroll the
bar down
or (what I found to better) move the scroll bar before you
go far. To
calibrate it for everything to fit and still not look
directly at the
screen (believe me it becomes a problem), you can use the
first reading
at the top left, the one which says "70 ft - 21 m", scroll the
bar until
this line disappears almost completely and that's it, the
page is alig-
ned to cover from lines 1st to 8th (well, not much of the
1st, but you
can still distinguish what is it; however, if you can't see
that letter,
you won't need to scroll the bar down as you won't see that
"extended
rest" anyway)
_________________
/ \
| Wanna print? |\
\_________________/|
\_______________/
About the size it'll be printed, it should be ok for any paper
which has
the width sized as an A4 paper which is the most common one.
However,
to check sizes, measure the first letter, it should be of about
1,25" /
3,2cm.
The print options however aren't much, so if for ANY reason it
doesn't
fit, you'll have to press the "Print Screen" key on your
keyboard,
load it on any Image edition program, paste in a new image and
print it
from there. And use that size (1,25" / 3,2cm. for the first
letter for
reference to change the paper's print resolution to fit the real
size it
should have.
______________________
/ \
| Final comments |\
\______________________/ |
\______________________/
Well, that's about it, I have nothing else to say by the moment,
if you
have ANY ideas or comments, insults or money ;) please contact
me. Also
about any other thing like this that could come in handy.
Many people did so and they made it by mail asking, so you see,
you too
can become FAMOUS by throwing a good idea ;)
Seriously talking, if you do any cool suggestion that makes this
program
to get better, I promise I'll put your name in this "Hall of
Fame" :)
Oh and I just figured it'd make more sense to put the Hall of Fame
ordered
backwards, like, the last first and the first last. Sorry to the
first collaborators
but you have already had your time at the top ;)
Hall of Fame:
---- -- ----
My apologies to another contributors to the version 3.1, as the
person who
provided me with the current image you get when printing, I lost
the mails and
I just don't have any more contact form. I'm sorry. To those of
you, you know
who you are and well... this is my attempt to mention you. Thank
you.
Thanks to Jim Tackett, he reported the bug at the printing that
printed the
Contrast window for error.
Thanks to Chris Duffield, he was the one who suggested this
black/white
button idea. That later became the contrast button you see,
which later
made me remake the whole thing.
Thanks to Christine Smith, she suggested (asked if it was possible,
actually)
a feature that makes character lines dissappear for easier use and
less confusion.
Part of this release's push belongs to her.
Thanks to Zvi Zoblin, he gave me the food and animals fonts to use
on the
Pictures.
Thanks to Ryan Roberts, he gave me the suggestion of the
printability and
corrected me some of the errors of the 2.0 version.
Thanks to Rajiv Bhushan for one, the Arial/Sans Serif idea, and
two, the
Tumbling E's chart.
Thanks to Harry Incs, the one who gave me the idea of the
"different
resolution/monitor problem" solution and the one who inspired me
to write
a longer version of this document (to be honest, to add this all
after the
Introduction :)
-----
Also a call to anybody who has the knowledge: I've read
somewhere that
there are some devices that "teach" you how to control the muscles
of your
eyes. I'm pretty sure that such a thing would be a VERY BIG help to
all of
us. If you do know how those machines work, I mean I'm sure they
show you
something and tell you to do certain things and voila, you've
learned to
control your eye muscles. THAT is something that could be very
possibly
recreated in a computer program that I'm sure I could do. If
anyone has
the knowledge about how that works, tell me and I'll do a
program that
does the same thing except that this would be for free.
____________________
/ \
| History |\
\____________________/||
\___________________/
So the "Final Comments" weren't final really, huh? :)
Well, I know that, but the History of the Program is the most
boring part,