CONTACTLENS

Message of common value

LENSES....
SO EASY !

WHAT IS CATARACT?

CLOUDING OF THE LENS

ARE THERE...
DISCREET MAGNIFIERS?

YES, SUCH AS EASYPOCKET

HOLIDAYS = LENSES

YOU ONLY HAVE 2 EYES:

CHECK YEARLY !

SEE CLEARLY !

SHOW YOUR EYES ...
WITH LENSES !!!

WHY DO YOU REGULAR NEED
EYE EXAMINATION WHEN YOU
HAVE GLAUCOMA?

YOU DON'T FEEL ANYTHING
BUT YOUR EYE CAN GET BLIND
SLOWLY
WHEN THE EYE PRESSURE
IS TO HIGH!

METAMORPHOSIS
(=curved lines)

THIS MAY INDICATE AGE
RELATED MACULA
DEGENERATION

DAILIES: SAY IT WITH
YOUR EYES!

CONTACTLENS » TORIC LENSES »

lenses with cylinder correction for astigmatism

THE FRONT OF THE EYE (= THE CORNEA) WITHOUT CYLINDRICAL ABERRATION IS SPHERICAL (= like a ball)
THE FRONT OF AN EYE WITH ASTIGMATISM IS OVAL (LIKE A RUGBY BALL): the horizontal axis is less curved than the vertical axis
THE IMAGE OF THE OUTSIDE WORLD GETS DISTORTED ON THE RETINA BECAUSE THE HORIZONTAL AXIS REFRACTS DIFFERENTLY THAN THE VERTICAL AXIS
THE VISION OF AN ASTIGMATIC IS DEFORMED (THE GRADATION DEPENDS ON THE SERIOUSNESS OF THE ASTIGMATISM)
WITH AN EYE EXAM CAN BE DETERMINED WHICH AXIS GIVES MOST DEFORMATION
WITH CONTACTLENSES WE CAN CORRECT MORE AXES THAN SOME YEARS AGO

What is a cylindrical aberration?

A cylindrical aberration has to do with the front surface of the eye. When the eye has an cylindrical aberration, the front surface is oval like a rugby ball, when the eyes doesn't have a cylindrical aberration the eye has a rond surface like a basketball.

When light falls through a round eye, it is focused on 1 point; when the light falls through the oval eye with a cylindrical aberration, it is focused on 2 points. the objects are not blurry.

Take this simple test:

When you cover 1 eye and look to the spokes of a wheel, it can be that you see some spokes darker or lighter than the other.
In that case you probebly have a cylindrical aberration.
Talk to your specialist and ask for an eye examination.

What are the effects of a cylindrical aberration?

People with a cylindrical aberration can't see horizontal and vertical lines sharp at the same time.
That's why they often have turbid or deformed view, for far and close distance:

Can soft lenses correct cylindrical aberrations?

"Toric lenses" are specially designed soft lenses for people with a cylindrical aberration.

Differences in toric lenses

Lenses with a cylinder may not rotate on the eye.
Otherwise you will see bleary sometimes. There are 2 stabilisation designs:

"Dynamic stabilisation"- design (ASD):                                   Prismballast design:
4 thick zonesthat are layed in the eyelidslit,                           1 thick zone on the underside of the lens takes care of
take care of a good orientation of the lens                a good orientation of the lens

What to think:

The "prism ballast" is a golden standard. Thee "dynamic stabilisation" is the newest form of stabilisation. A good toric lens has to give a good view fast after you put in the lens and has to give perfect view continual even if the eyes move constantly. Both forms of stabilisation go very well. You will feel that the lenses with 4 stabilisation zones stabilise a little bit faster and better.
Know that there are different types of toric lenses, you can always try an other type.
Lens-examples

* prismballast:

Soflens toric
Purevision toric

* dynamic stabilisation:

Acuvue Oasys for astigmatism
Acuvue Advance for astigmatism

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