Laser-Assisted In Situ Keratomileusis
Eye Care
estimated about CNY 12000-20000
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Description
A refractive surgical procedure using an excimer laser to reshape the cornea by creating a thin flap and ablating underlying stromal tissue to correct myopia, hyperopia, and astigmatism.
Main Uses
Primary clinical use is correction of refractive errors including myopia, hyperopia, and astigmatism in eligible adults (18+ years) with stable vision. Applicable scenarios include occupational requirements (e.g., military, pilots), lifestyle-driven vision independence, and dissatisfaction with glasses/contacts — provided strict candidacy criteria (adequate corneal thickness, healthy ocular surface, no keratoconus, no active autoimmune disease) are met.
Normal Range
LASIK is not a diagnostic laboratory test with numerical 'values' or 'ranges'; it is a surgical procedure. Therefore, there is no 'normal range' for LASIK itself. Preoperative assessments (e.g., corneal thickness, refractive error, pupil size, wavefront aberrations) have individual reference ranges: corneal thickness ≥500 µm, spherical equivalent −12.00 to +6.00 D, cylinder ≤6.00 D, pupil diameter <8 mm in dim light, wavefront RMS error <0.3 µm (low-order), and stable refraction (>1 year).
Low Values - Possible Causes
Low preoperative corneal thickness (<480–500 µm), low corneal curvature (flat keratometry <39.0 D), low tear film stability (Schirmer test <10 mm/5 min or TBUT <5 sec), low endothelial cell density (<2000 cells/mm²), and low refractive stability (progressive myopia >0.5 D/year).
High Values - Possible Causes
High preoperative myopia (>−10.00 D), high astigmatism (>4.00 D), high corneal curvature (steep keratometry >48.0 D), high higher-order aberrations (RMS >0.5 µm), and high intraocular pressure (>22 mmHg) — all of which may increase surgical risk or contraindicate standard LASIK.
estimated about CNY 12000-20000
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