An eye with astigmatism has an unusually shaped cornea. Thus the light doesn’t enter the eyes correctly, making the vision blurry and hazy. It can affect both close and distant vision. Astigmatism vision is a common eye disorder affecting 3 million people every year. If you or any of your loved ones are detected with astigmatism, this article is a perfect read for you.
Comprehensive information is compiled here about types of astigmatism. Check it out!
Classification of astigmatism vision is based on the focal point or the principal meridians of your eyes. We will explain both.
Following are the 5 types of astigmatism which are based on focal points of your eyes:-
1. Simple Myopic Astigmatism
The vertical images in front of you get out of focus and appear unclear in this condition. Simple myopic astigmatism is an amalgamation of effects of astigmatism with myopia or nearsightedness. It means one principal meridian focuses on the retina, and the other focuses in front of the retina.
2. Simple Hyperopic Astigmatism
Simple hyperopic astigmatism is a condition where you face astigmatism vision along with hyperopia or farsightedness. One principal meridian focuses on the retina in this condition, and another central meridian focuses behind the retina. As a result, you see the horizontal images blurry because they get out of focus.
3. Compound Myopic Astigmatism
In compound myopia astigmatism, you suffer from astigmatism and nearsightedness or myopia like the simple myopic astigmatism. But in this condition, both the principal meridians focus in the front of the retina. It means the light will come to focal points making the vision unclear and distorted.
4. Compound Hyperopic Astigmatism
In compound hyperopic astigmatism, both the principal meridian focuses behind the retina. Thus it is a combination of astigmatism and farsightedness or hyperopia. The light comes to two focal points, which are virtually located behind the retina. But both locations will be at a distance behind the retina.
5. Mixed Astigmatism
In mixed astigmatism, light comes to a focal point which is behind the retina. And it also comes to a focal point which is before the retina. In this condition, you may have hyperopia in one meridian and myopia in another meridian.
Following are the types 2 types of astigmatism which are based on the principal meridians of your eyes:-
1. Regular Astigmatism
In regular astigmatism eye, the principal meridians stay 90 degrees apart from each other. As a result, you experience variation in refractive power from one meridian to another. This is one of the most common types of astigmatism caused due to irregular lens curvature or corneal. Blurry vision, light sensitivity, headaches are some of its most troublesome symptoms.
2. Irregular Astigmatism
In irregular astigmatism also the principal meridian stays apart but not at a 90-degree angle. Instead, the curvature at each meridian keeps changing from one point to other. A minor form of this eye disorder can be found in everyone, but it’s irrelevant. It is rare for irregular astigmatism to be medically diagnosed as a vision problem. It happens due to uneven corneal surface, surgery side-effects, or natural causes.
The information given here can serve as your reference point to understand astigmatism in a better way. However, only a qualified eye doctor or optometrist can conclude the type of astigmatism vision you have based on a detailed eye exam. They will prescribe a suitable treatment based on the result of your diagnosis. Even if your eyes appear healthy in an eye exam, it is advisable to get your eyes checked regularly. This is because your vision keeps changing with time.