角膜地形图检查
眼科项目
≈ ¥200-400
(≈ $30-60)
大约15-30分钟
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项目介绍
角膜地形图检查在一般公立医院参考费用约¥140-320，三甲医院参考费用约¥200-400，常用于相关诊断评估与就医安排，费用随医院及地区有所差异。
主要用途
Primary clinical uses include: preoperative screening and planning for refractive surgery (LASIK, SMILE, ICL), diagnosis and staging of ectatic disorders (e.g., keratoconus), contact lens fitting (especially for rigid gas-permeable or scleral lenses), assessment of corneal irregularity post-surgery or trauma, monitoring progression of corneal disease, and evaluation of corneal transplant outcomes.
正常值范围
Corneal topography is a qualitative and quantitative imaging test; no universal 'numerical normal range' applies to all parameters. Key metrics include: Simulated Keratometry (SimK) 43.0–45.0 D (average of steepest and flattest meridians), Astigmatism < 1.0 D, Surface Asymmetry Index (SAI) < 0.28, Surface Regularity Index (SRI) < 0.16, Correlation Index (CI) > 0.98, and Central Corneal Thickness (CCT) 530–550 µm. Normal maps show symmetric, concentric, smooth curvature with minimal irregularities and no localized steepening or flattening.
偏低可能原因
Low keratometric values (e.g., SimK < 42.0 D) may result from: 1) Post-refractive surgery (e.g., LASIK/SMILE overcorrection), 2) Keratoconus in early or forme fruste stages with paradoxical central flattening, 3) Chronic corneal edema causing optical smoothing and artifactually reduced curvature, 4) Advanced Fuchs’ endothelial dystrophy with epithelial microcystic changes, 5) Prior penetrating keratoplasty with donor graft flattening.
偏高可能原因
High keratometric values (e.g., SimK > 47.0 D) may result from: 1) Keratoconus (progressive anterior corneal steepening), 2) Pellucid marginal degeneration (inferior peripheral steepening), 3) Post-cataract surgery corneal warpage or incision-induced astigmatism, 4) Corneal scarring or hydrops-related ectasia, 5) Terrien’s marginal degeneration with adjacent steepening.