角膜曲率测量
眼科项目
≈ ¥20-50
(≈ $3-7)
大约15-30分钟
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项目介绍
角膜曲率测量在一般公立医院参考费用约¥15-40，三甲医院参考费用约¥20-50，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 uses include preoperative assessment for cataract surgery (IOL power calculation), fitting of contact lenses (especially rigid gas-permeable and scleral lenses), diagnosis and monitoring of corneal ectatic disorders (e.g., keratoconus), evaluation of corneal astigmatism, and detection of corneal irregularities following trauma or surgery.
正常值范围
Corneal curvature is typically measured in diopters (D) or millimeters (mm) of radius of curvature. Average keratometry values: 43.0–45.0 D (or 7.6–8.0 mm radius); with astigmatism < 1.0 D considered normal. Steep meridian usually 43–45 D, flat meridian 42–44 D; difference (astigmatism) ≤ 1.25 D is typical in healthy eyes.
偏低可能原因
Keratoconus (early stage with paradoxical flattening), corneal edema (e.g., Fuchs’ dystrophy), post-penetrating keratoplasty flattening, chronic contact lens-induced corneal warpage (especially rigid lenses), and advanced bullous keratopathy.
偏高可能原因
Keratoconus (progressive steepening), pellucid marginal degeneration, post-refractive surgery ectasia (e.g., LASIK complications), acute corneal hydrops, and congenital corneal steepening (e.g., megalocornea or microcornea variants).