高度远视有哪些眼部特征?
据报道,高度远视患者的眼轴通常较短,但也有个别患者的眼轴较长。由于这些患者的眼睛调节功能相对较弱,因此他们无法自主调节视力,这导致他们更加依赖远视能力。
那么,高度远视有什么眼部特征?
远视眼的危害多种多样。长时间用眼容易疲劳,近距离工作或阅读时间有限,甚至难以看清近处的物体,但却能够较清晰地看远处的物体。因此,及早进行远视检查并接受治疗是必要的。那么,高度远视眼有哪些特征呢?请听专家解答。
1、高度远视眼伴眼前节缩短 is characterized by a short eye axis (less than 22mm) and a proportionate shortening of the anterior segment. Clinical manifestations include small cornea with a diameter <10mm, normal corneal thickness, lower than normal endothelial cell count on corneal photography; shallow anterior chamber, narrow angle, often accompanied by closed-angle glaucoma; thick and dark iris pigment; normal or relatively small lens size. The iris is pushed forward, causing angle closure and increased intraocular pressure. This condition is more common in younger patients, typically under 40 years old. Some patients may have a long history of glaucoma medication before cataract surgery, manifesting as small pupils, posterior synechiae, pupillary membrane closure, and lens opacity. Some patients may have a history of peripheral iridectomy.
2、眼前节正常的高度远视眼是指眼轴短、眼球较小,但角膜直径、前房深度和房角正常。患者从小就需要佩戴高度远视镜,超声波检查发现眼轴短,前房深度正常,巩膜和脉络膜增厚。
3、正常眼前节的高度远视白内障患者,人工晶体计算的度数高于眼前节缩短的高度远视白内障患者。正常人的眼前节数据如下:眼球前后径为24mm,垂直径为23mm,水平径为23.5mm;角膜横径在11.5~12mm之间,垂直径在10.5~11mm之间,中央部厚度在0.50~0.55mm之间,周边部厚度为1mm;前房中央深度为2.5~3mm;晶状体直径为9mm,厚度为4mm,容积为0.2ml;巩膜厚度分别为:眼外肌附着处为0.3mm,赤道部为0.4~0.6mm,视神经周围为1.0mm,近角膜缘部为0.6mm;脉络膜平均厚度约为0.25mm,脉络膜上腔间隙在10~35um之间。
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