How accurate is Lasik in correcting vision, and what affects the final result?

Lasik outcomes are highly predictable for most candidates, with over 90% achieving 20/20 vision or better and nearly all reaching 20/40 (driving standard), thanks to advanced mapping and lasers tailored to your eye’s unique shape. Patient satisfaction hits 96-99%, but results vary based on your starting prescription-lower ones (under -6 diopters) succeed most reliably, while higher ones may need enhancements in a small fraction of cases.​

Key factors include corneal thickness and health (thin or irregular shapes limit reshaping), pupil size (large ones risk night glare), dry eye severity, age (under 40 ideal, as presbyopia later needs readers), and stable prescription (unchanged 1+ years). Lifestyle like screen time or outdoors also plays a part; a detailed pre-op exam predicts your odds accurately, so good candidates often get exceptional, lasting clarity.