Is It Better to Have Larger Pupils When Getting LASIK Surgery?
Is It Better to Have Larger Pupils When Getting LASIK Surgery?
Generally, younger people tend to have larger pupils, while those in their 40s or 50s experience a decrease in pupil size to below average. You may have noticed that squinting sometimes makes your vision appear clearer — this is because when the pupils are larger, more unnecessary light enters the eye, which can blur vision. Squinting reduces that excess light, improving clarity.
Similarly, having smaller pupils naturally creates an effect similar to squinting, allowing for better visual quality. On the other hand, larger pupils can sometimes cause a sense of blurred or unfocused vision.
Is It Risky If the Treatment Area Becomes Wider due to Having Large Pupils?
During vision correction surgery, the optical zone refers to the actual area of the cornea that is reshaped by the laser. The surgery doesn’t correct the entire visible iris — only about a 6 to 6.5 mm area in the center.
If the pupil is too large, performing surgery on a 6 mm zone can cause the treated and untreated areas to overlap, leading to glare or halos due to differences in the optical surface. Because larger pupils allow more light to enter, the surgical area is often expanded to about 6.5 mm or more to match the pupil size.
However, simply increasing the optical zone isn’t always better — it also means more corneal tissue must be removed, which can increase the margin of error and the risk of reduced vision quality. Additionally, it can weaken the cornea. Therefore, it’s important to determine the surgical range carefully for each individual.
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