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ASTIGMATISM -RUGBY BALL SHAPED EYES

What is Astigmatism ?

Astigmatism  is very common, and occurs in varying amounts in the population but has a complicated name and little bit hard to explain !

An optician may refer to astigmatism as  rugby ball shaped eyes  or even egg shaped eyes.

Instead of the eye shape being football, spherical shaped - it is rugby ball  shaped - more oval than round.

It is either the cornea or the natural lens inside the eye that may be irregular shaped.

Most people can have small amount of astigmatism and it usually co-exists with short sighted or long sighted.  

 

 

 

Symptoms of rugby ball shaped eyes

In Astigmatism , the image formed can have ghosting or shadow effect where the letters of image could be “split” slightly.

Astigmatism may cause eyestrain as well as blurred vision.

Sometimes even small amounts of rugby shaped eyes can cause symptoms.

 

 

 

 

Treatment of astigmatism.

Rugby ball shaped eyes  can usually be corrected successfully with lenses that have a cylinder component - which needs to be set at a specific angle which opticians note down as axis on the prescription.

The axis is needed because a rugby ball can be rotated into any orientation  - whereas a football rotated will look the same.

Power is in Dioptres and noted down as DC ( c is for cylinder)  

For short and long sight prescriptions without astigmatism,  it is corrected by sphere shape lenses and is noted down as  DS - dioptres and sphere.

Many people need to correct both the astigmatism and spherical error of short or long sighted - they would have both the sphere and cylinder correction.

 

Astigmatism  may be at 90 degrees and 180 degrees or at any angle.

People with astigmatism at oblique angles such as 45 degrees may find even a small amount of error may cause symptoms. This is partly due to the real world environment where most things are at horizontal and vertical degrees like the computer monitor screen, furniture etc