A型超声检查（眼轴及生物测量）
眼科项目
≈ ¥60-120
(≈ $9-17)
大约15-30分钟
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项目介绍
A型超声检查（眼轴及生物测量）在一般公立医院参考费用约¥40-95，三甲医院参考费用约¥60-120，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 intraocular lens (IOL) power calculation for cataract surgery, diagnosis and monitoring of myopia progression and pathological myopia, assessment of microphthalmia/nanophthalmos, evaluation of suspected globe size abnormalities, and biometric confirmation when optical biometry (e.g., IOLMaster) is contraindicated (e.g., dense cataracts, corneal opacities, or small pupils).
正常值范围
A-scan ultrasonography for ocular biometry measures axial length (AL), anterior chamber depth (ACD), lens thickness (LT), and vitreous depth (VD). Normal adult axial length: 22.0–24.5 mm; ACD: 2.5–3.5 mm; LT: 3.6–4.5 mm; VD: 15.0–17.5 mm. Values vary by age, ethnicity, and refractive status (e.g., children have shorter AL; myopes often >24.5 mm; hyperopes often <22.5 mm).
偏低可能原因
Congenital microphthalmia, nanophthalmos, high hyperopia, posterior scleral staphyloma (rare, atypical presentation), measurement error due to dense cataract or corneal opacity, or operator inexperience.
偏高可能原因
Axial myopia (most common), pathological myopia with posterior staphyloma, vitreous hemorrhage or detachment causing overestimation, silicone oil tamponade post-vitrectomy, and erroneous calibration (e.g., incorrect sound velocity setting for aphakic or pseudophakic eyes).