Can surgery be performed on patients with high astigmatism?

High astigmatism is a common retinal disease. When high astigmatism occurs, it will cause blurred vision in patients, and is often accompanied by dizziness and headaches, and the vision is also relatively tired. Generally, conservative correction can be performed first. If it cannot be corrected, surgical treatment can be performed, but there is no guarantee that the surgery will be 100% effective, and this disease is relatively special.

Introduction

Compound astigmatism refers to the inability of light from two perpendicular meridians to focus on the retina. If the foci of the two perpendicular meridian rays both fall in front of the retina, but their degrees are unequal, it is called compound myopic astigmatism; conversely, if they both fall behind the retina and their degrees are unequal, it is called compound hyperopic astigmatism.

concept

Because the refractive power on the two meridians of the refractive system is different, a focus cannot be formed, resulting in reduced vision. A diopter greater than 4.00 diopters is called high astigmatism. In principle, high astigmatism should be corrected as much as possible. However, for adults who have not worn glasses before, high-power corrective glasses may be difficult to accept at first and should be corrected gradually to avoid symptoms such as dizziness and visual fatigue.

symptom

For people with high astigmatism, it is often only blurred vision, while headaches or visual fatigue are mild or rare. However, when high astigmatism is close to full correction, these symptoms may occur instead, which is due to the remaining uncorrected mild astigmatism. In addition, they often squint their eyes to reduce astigmatism and move the objects they view closer to obtain a larger retinal image. For myopic astigmatism, although the distance vision is very poor, the near vision is still normal or close to normal. In addition, the near vision is often used continuously in daily life and work, which provides an opportunity for the myopia function to be exercised. Therefore, myopic astigmatism rarely develops disuse amblyopia.

Spectacles

Highly astigmatic lenses are difficult to make due to their high degree, so for astigmatism less than 800 degrees, high-refractive-index resin sheets can generally be selected, and a refractive index of 1.67 is most suitable. However, if the astigmatism is greater than 800 degrees, it is better to choose glass sheets, such as those with a refractive index of 1.8 or 1.9. This can ensure that the processing reaches the required degree and the lens will not appear too thick.

When choosing a frame, the particularity of extreme astigmatism should also be considered. Since the edge thickness of astigmatism lenses varies greatly, the choice of frames is particularly important. You should choose pure titanium or titanium alloy frames with strong toughness. You can also choose acetate fiber and plate frames with better shrinkage. However, it is not advisable to choose frameless or semi-frame lenses, otherwise the lenses may be damaged or cracked during processing and use.

There are also some precautions for daily use of glasses with extremely high astigmatism. When putting on and taking off the glasses, you should hold the temples with both hands, apply force evenly, put them on and take them off gently, and avoid putting them on or taking them off with one hand. When you are not wearing your glasses, you must keep them in the glasses case to avoid pressure on the glasses and damage to the lenses.