but the optician never explained what it is been told to wear glasses when reading and watching tv

Well it just means you cannot focus clearly on detailed objects.

For instance your RX reads, " OD Pl-.50 X 180 and OS Pl-.75 X 180. You can see the 20/20 line okay but it is not sharp.

Use them all the time and you will see better! Do not and you will not!

yes it just means your eyes are a slight oval shape...its nothing to worry about as its not painful or anything to be concerned about. I have an astigmatism and the only thing it means is my prescription for glasses and contact lenses slightly different!

Astigmatism is a irregular cornea shape. Instead of being a smooth surface...you have hills and valleys.

Astigmatism* is only a particular version of short or long sight.
If you have some, and just about everyone does if measured accurately enough, though it's usually not enough to put into an Rx, it affects your vision at every distance, not just at one range, which can happen with a straightforward "spherical" Rx.

That's why your glasses can be useful for distance *and* near.
It doesn't mean you have to wear them alll the time, unless you like the better vision or reduced fatigue, in which case there's no reason why you shouldn't.

It doesn't mean your eyes are irregular.
(there's a category, "irregular astigmatism" to cover the rarer cases where that occurs, and glasses don't much help, there.)

If you were short-sighted, and looked at a black dot on a white screen in the distance, you'd see a round blur.
The dot will have stretched, gone out of focus, in every direction.

If you had only short-sighted astigmatism, and looked at a black dot on a white screen in the distance, you'd see a line.
The dot will have stretched, gone out of focus, in only one direction. The line could run in any direction.

This gives the three numbers needed for an eye's Rx.
The first number is the amount needed to get that round blur into focus in at least one direction.
If everything is now in focus, there is no astigmatism.
The second number is the extra amount that needs to be added or subtracted to get the second direction in focus,
(at 90 degrees to the first.) The third number is, in degrees, the direction in which to apply this. It's only a direction so 170 is not "worse" than 10.


*Strictly not "an astigmatism". It's a quantity, like milk, rather than a discrete item or object like an apple.

An Astigmatism is an optical defect, whereby vision is blurred due to irregular curvature of the cornea or lens. Astigmatism causes difficulties in seeing fine detail, and in some cases vertical lines (e.g., walls) may appear to the patient to be leaning over.

It is a very common problem. Fortunately, Astigmatisms tend to be more stable over time than near sightedness or far sightedness. Consequently, your prescription won't need to change as often. At least that is what my doctor told me when I inquired. I was diagnosed when i was in college...20 years later and my eyesight has barely changed.

Your eyes are oddly shaped, like footballs. But you should wear them all the time. Youre vision gets better.

Your eyeballs are rugby ball shaped, like mine.

Think it's when your eye balls are an oval shape rather than rounded

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