Astigmatism occurs when the cornea or lens has different curvatures in different meridians, so light does not focus to a single sharp point. This can cause blurred or distorted vision at both distance and near.
Causes and correction
Astigmatism is often present from birth and may occur alongside myopia or hyperopia. Management typically involves glasses or contact lenses with cylindrical power; in suitable adults, refractive surgery or toric intraocular lenses can also correct it.
- Uncorrected astigmatism may lead to eyestrain and headaches
- Regular refraction helps maintain clear and comfortable vision
- Toric soft or rigid lenses are options for contact lens wearers
- Significant changes in astigmatism over time may warrant further investigation
