What is toric contact lens astigmatism

What is astigmatism (curvature of the cornea), what are toric contact lenses?

Medically checked by Anna Sucha, optician, on April 2nd, 2020
Written by Leonie Bauer

Definition of astigmatism

Astigmatism is an aspherical refractive defect in which the eye has different refractions in two sections. Astigmatism can be regular (the most common form) or irregular.

  • Regular astigmatism - looks more like a rugby ball (the curvature of the meridians is uniform).
  • Irregular astigmatism - associated with trauma, disease or degeneration, strange shape, scars (none of the curvatures of a single meridian is uniform).

Astigmatism can affect not only the cornea, but the lens or retina as well.

  • Corneal astigmatism (the most common type of astigmatism)
  • Astigmatism of the lens of the eye
  • Retinal astigmatism

Astigmatism is a type of ametropia in which the eye does not focus light evenly on the retina. The elongated cornea lets the light-reflected objects focus on two points on the eye pupil instead of just one, which is why vision is blurred. This refractive error requires other correction, special contact lenses with cylinder and axis values.

You can read more about the different types of parameters, especially for toric contact lenses, in this blog article.

Astigmatism works on a different principle, but is often accompanied by nearsightedness or farsightedness. For this reason, it is not possible to correct astigmatism with normal lenses or glasses that only have the plus or minus power. For this purpose, toric contact lenses are usually prescribed for eye patients with astigmatism. These astigmatism contact lenses have a thicker zone on the bottom to keep them from rotating in the eye. This helps align the lenses consistently and predictably for better visual acuity.

Appropriate contact lenses for astigmatism

Here is an overview of contact lenses for astigmatism.

Three main types of astigmatism (astigmatism)

  • Myopia Astigmatism: One or both of the main meridians of the eye is nearsighted. (If both meridians are nearsighted, they are myopic to different degrees.)
  • Hydropic Astigmatism: One or both of the main meridians is farsighted. (If both meridians are farsighted, they are hydropic differently.)
  • Mixed astigmatism: one major meridian is nearsighted and the other is farsighted.

Diagnosing astigmatism

Astigmatism is detected during a routine eye exam using the same instruments and techniques used to detect nearsightedness and farsightedness! be used.

Your ophthalmologist can measure the strength of the astigmatism by determining the refraction of the eye. The directions of movement of light phenomena (secondary light source) on the retina of the test subject's eye are observed. This procedure is known as retinoscopy (shadow sample) or retinoscopy.

Symptoms of astigmatism

Symptoms can vary from person to person, and it is also possible that they may not experience any symptoms at all. Some of the most common symptoms are the unclear picture and blurred vision. They can vary along with the degree of astigmatism. If the astigmatism is too small, no vision problems will be noticed. If the degree of astigmatism is higher, it mainly causes fatigue in the eyes when doing a lot of computer work because the eye has to keep adjusting.

In fact, most people are likely born with some degree of astigmatism, or very often it is inherited. If you're noticing symptoms of astigmatism, take a look at your family tree. There is a good chance that someone in your family had astigmatism as well. If astigmatism is detected in early childhood, there is a chance that it will increase or decrease as you age. Astigmatism can also result from an injury or eye surgery.

Treatment of astigmatism

There are several ways to correct astigmatism:

Toric contact lenses (or corrective glasses) Typically, patients with astigmatism are prescribed toric lenses to correct their vision. Toric lenses have a larger angle of reflection in a certain direction.

After your doctor performs the eye test on you, they will determine which lenses are best for the shape of your eyeball and your astigmatism.

Operative astigmatism correction This is another method of correcting astigmatism. It consists of a change in the shape of the eye's cornea, which is done through refractive or laser eye surgery. In order to perform this type of procedure, you must not have problems with the retina, wounds and scars on the cornea, and other eye diseases.

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Comments

  • Search for my atigmatism through hub month lens :. r. 8.3 Ot 14.50 sph +3.50 cyl - 5.75 x75 please send us an offer

    reply
    • Hello Magdi, we can offer you different brands. The important thing is which brand or material your optician has prescribed for you. Please send us a photo of the packaging or blisters and we will send you an offer.

      Nice day! Terézia

      reply

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