Ashkan ASTIGMATISM Presentation

ASTIGMATISMASTIGMATISM

AstigmatismAstigmatism

AstigmatismAstigmatism

ASTIGMATISM MEANS THAT THE CORNEA ASTIGMATISM MEANS THAT THE CORNEA IS OVAL, LIKE A FOOTBALLIS OVAL, LIKE A FOOTBALL

AstigmatismAstigmatismA normal cornea has spherical shapeA normal cornea has spherical shapeMost astigmatic corneas have two curvesMost astigmatic corneas have two curvesAstigmatism often occurs along with Astigmatism often occurs along with nearsightedness or farsightednessnearsightedness or farsightedness

AstigmatismAstigmatism

Signs, Symptoms, and CausesSigns, Symptoms, and Causes

Blurred vision near and distanceBlurred vision near and distanceAstigmatism is usually hereditaryAstigmatism is usually hereditaryMany people born with an oblong Many people born with an oblong corneacorneaAstigmatism may also result from an eye Astigmatism may also result from an eye injuryinjury

AstigmatismAstigmatism

AstigmatismAstigmatism

Detection and DiagnosisDetection and Diagnosis

Astigmatism can be corrected withAstigmatism can be corrected witha.a. EyeglassesEyeglassesb. Contactsb. ContactsC. SurgicallyC. Surgically

AstigmatismAstigmatism

AstigmatismAstigmatism

AstigmatismAstigmatism

Astigmatism testAstigmatism test

Astigmatism TestAstigmatism Test

If you do not see all the lined squares, in If you do not see all the lined squares, in the same black color, if you do see one or the same black color, if you do see one or more squares grey, you then have an more squares grey, you then have an astigmatism.astigmatism.ASK FOR A SPECIALIST ADVICE!!!ASK FOR A SPECIALIST ADVICE!!!

Astigmatism TestAstigmatism TestClose one eye and then the other Close one eye and then the other

one one

AstigmatismAstigmatismTreatmentTreatment

Most common surgeries used to correct Most common surgeries used to correct astigmatism are:astigmatism are:Astigmatic KeratotomyAstigmatic KeratotomyLAZIKLAZIK

The objective of these procedures is to The objective of these procedures is to reshape the cornea from oval to spherical reshape the cornea from oval to spherical or uniformly curvedor uniformly curved

Eyelid held open & alignedEyelid held open & aligned

flap cut back exposing inner layersflap cut back exposing inner layers

Suction plateSuction plate

Cornea flattened, inner eyelid of Cornea flattened, inner eyelid of cornea cornea eposedeposed

flap folded backflap folded back

Tracking ringTracking ring

Flap returnedFlap returned

Closing the flapClosing the flap

Astigmatism Astigmatism

Conclusion:Conclusion:Depending on the type and severity of Depending on the type and severity of

astigmatism it can be treated and astigmatism it can be treated and corrected by eyeglasses, contacts, and corrected by eyeglasses, contacts, and surgery.surgery.In all three procedures the oblong cornea In all three procedures the oblong cornea is corrected to its spherical form cornea. is corrected to its spherical form cornea.

Astigmatism ResourcesAstigmatism Resources

http:images.google.comhttp:images.google.comhttp://www.perrethttp://www.perret--optic.ch/optometric/testoptic.ch/optometric/testhttp://www.microscopyu.comhttp://www.microscopyu.comhttp://www.medindia.nethttp://www.medindia.nethttp://www.healthatoz.com/http://www.healthatoz.com/