What is Irregular Astigmatism?

What is Irregular Astigmatism?

Most people live with irregular astigmatism. However, irregularity gets worse in certain cases, the individual may experience that it is hard to achieve clear vision even with corrective lenses. This means that no matter how well glasses are prescribed, vision does not improve beyond a certain level. People may experience a sudden decline in visual clarity and report symptoms related to this visual fluctuation.

Another common symptom is experiencing glare or halos, especially for individuals with larger pupils, as these symptoms tend to worsen in low-light conditions.

Irregular astigmatism can also occur after SMILE LASIK surgery. A key factor in avoiding it is ensuring the correction is centered accurately on the visual axis. If the surgery is performed off-center, it can lead to irregular astigmatism. Therefore, proper alignment with the visual axis is critical to minimizing this risk.

What is Visual Axis?

The Visual Axis is an imaginary line that connects the fovea (the center of the retina). 

In the past, LASIK surgery was performed based on the pupil center or corneal center. However, since there is some difference from the actual visual axis, it is crucial to analyse the correct visual axis by using AcuTarget technology. 

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