Avatar universal

What happens when astigmatism is treated with increasing the diopres?

When I was a child (12 year old +) I got prescription glasses by reading the Snellen chart only, no automated keratometry. He measured the degree of astigmatism with a ruler (kind of device) manually.
I worry about the following:
- Does increasing the dioptres result in a sharper image when the problem is with astigmatism?
- If astigmatism is tried to be corrected with increasing dioptres, will the eye's axial length increase to adjust to the strong glasses (in case of a teenager)?
1 Responses
Sort by: Helpful Oldest Newest
177275 tn?1511755244
A refraction (glasses test) can be done using an automated instrument or manually.  (the former called objective refraction, the latter called subjective).   In a cooperative patient rarely does an Eye MD or OD give the machine created without doing a subjective test.   Lens powers including astigmatism are measured in diopters.   Lens for astigmatism have diopters that only work in one direction (aspherical or astigmatic) not 360 degrees (spherical).   Glasses don't affect the axial length is adults/teenagers.  Besides astigmatism is not determined by axial length; myopia and hyperopia are. Astigmatism comes from an aspherical cornea or natural lens inside eye or both.
Helpful - 0
Have an Answer?

You are reading content posted in the Eye Care Community

Top General Health Answerers
177275 tn?1511755244
Kansas City, MO
Avatar universal
Grand Prairie, TX
Avatar universal
San Diego, CA
Learn About Top Answerers
Didn't find the answer you were looking for?
Ask a question
Popular Resources
Discharge often isn't normal, and could mean an infection or an STD.
In this unique and fascinating report from Missouri Medicine, world-renowned expert Dr. Raymond Moody examines what really happens when we almost die.
Think a loved one may be experiencing hearing loss? Here are five warning signs to watch for.
When it comes to your health, timing is everything
We’ve got a crash course on metabolism basics.
Learn what you can do to avoid ski injury and other common winter sports injury.