This study in the Journal of Cornea and External Disease determined whether or not chalazion affects refractive error. It concludes: Chalazion increases higher-order aberrations, as measured by the Hartmann–Shack aberrometer, which could affect the preoperative evaluation and results of refractive surgery, especially wavefront-guided approaches. Chalazion excision could reduce ocular aberrations and is recommended before refractive surgeries.
My personal experience is the same with dermatochalasis. That means we should delay corrective refraction if a person is considering surgery.
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