What astigmatism changes
Astigmatism occurs when the cornea or the lens inside the eye bends light unevenly. Vision may look blurred or distorted. It is a refractive error, and glasses or appropriately fitted contact lenses can help correct it.
Symptoms do not reveal the prescription
Squinting, headaches and difficulty seeing at night can accompany astigmatism, but a symptom or an online picture cannot determine the cylinder power or axis. Mild astigmatism may cause few noticeable symptoms. An examination establishes whether correction is needed.
Describe one real task
Before your appointment, note whether the difficulty is reading subtitles, road signs or a computer screen. Record whether it affects one eye or both, whether it happens with your current glasses, and when it started. These notes make the conversation more specific.
Keep a useful comparison
Bring your old glasses and written prescription if available. Our editorial suggestion is to ask the practitioner to explain any change and arrange a follow-up for unresolved blur. Do not choose an axis by copying someone else’s prescription.
Sources & verification
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