眼轴长度测量（IOLMaster或Lenstar）
眼科项目
≈ ¥20-50
(≈ $3-7)
大约15-30分钟
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项目介绍
眼轴长度测量（IOLMaster或Lenstar）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
1. Intraocular lens (IOL) power calculation prior to cataract or refractive lens exchange surgery; 2. Myopia progression monitoring in children and adolescents; 3. Diagnosis and staging of pathologic myopia; 4. Preoperative assessment for corneal refractive surgery (e.g., to exclude contraindications like nanophthalmos or excessive axial length); 5. Research and clinical trials evaluating anti-myopia interventions (e.g., atropine, ortho-K).
正常值范围
Typical adult axial length ranges from 22.0 mm to 24.5 mm; mean ~23.5 mm. Children show age-dependent norms: newborns ~16–19 mm, 1-year-olds ~19–21 mm, 6-year-olds ~21–22.5 mm, reaching adult values by adolescence. Values <22.0 mm suggest relative hyperopia; >24.5 mm indicate myopia risk. Measurement precision: ±0.02 mm (IOLMaster 500/700) or ±0.01 mm (Lenstar LS 900).
偏低可能原因
1. Hyperopia (farsightedness) due to shorter-than-average globe development; 2. Microphthalmos (congenital small eye); 3. Nanophthalmos (rare, extreme shortening with thick sclera and high IOP risk); 4. Post-cataract surgery anterior chamber depth artifact (rare, if misalignment occurs); 5. Corneal opacity or dense cataract causing signal failure and underestimation (though more commonly leads to measurement failure than low value).
偏高可能原因
1. Axial myopia (most common cause — elongated posterior segment); 2. Pathologic myopia (progressive elongation with staphyloma, chorioretinal atrophy); 3. Scleral ectasia (e.g., in Marfan syndrome or Ehlers-Danlos); 4. Post-traumatic globe distortion (rare, asymmetric elongation); 5. Misalignment or off-axis measurement in highly myopic eyes leading to overestimation (less common with modern swept-source OCT-based devices like Lenstar LS 900).