H52.2: Astigmatism

Your eyes have a refractive error. As a result you have problems seeing clearly up close and in the distance.

The transparent cornea is on the outside of the eye above the pupil. The cornea is considerably curved. In this way, light is focused in the eye. This is vital to be able to see clearly.

Behind the pupil is the lens. The lens of the eye is oval, transparent, and seated within a firm capsule. The lens of the eye can bend to different degrees, thus focusing the light in the eye. This is vital if objects at different distances are to be seen clearly.

Rays of light enter the eye through the cornea and the lens. The image that you see then appears at the back of the eye on the retina. The light has to be focused just right for a person to see clearly. This process is also known as refraction.

In your case, the light is not focused properly in all directions. This may be caused by irregular curvature of the cornea, for example. This results in a distorted image on the retina. Your vision is then blurred.

Additional indicator

On medical documents, the ICD code is often appended by letters that indicate the diagnostic certainty or the affected side of the body.

  • G: Confirmed diagnosis
  • V: Tentative diagnosis
  • Z: Condition after
  • A: Excluded diagnosis
  • L: Left
  • R: Right
  • B: Both sides

Further information


This information is not intended for self-diagnosis and does not replace professional medical advice from a doctor. If you find an ICD code on a personal medical document, please also note the additional indicator used for diagnostic confidence.
Your doctor will assist you with any health-related questions and explain the ICD diagnosis code to you in a direct consultation if necessary.


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