cornea

简明释义

英[ˈkɔːniə]美[ˈkɔːrniə]

n. [解剖]角膜

n. （Cornea）人名；（法、罗）科尔内亚

复 数 c o r n e a s 或 c o r n e a e

英英释义

单词用法

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例句

1.The lesions were found in the conjunctiva, episclera, cornea, iris, lens, vitreous, and retina.

病变见于结膜，上巩膜，角膜，虹膜，晶状体，玻璃体和视网膜。

2.If left alone, they eventually can grow large enough to cover the cornea and impair sight.

如果不加治疗，它们最终会增大到足以覆盖角膜从而损伤视力。

3.The cornea is the eye's clear outer surface that provides most of the visual power.

角膜是眼球外侧一层透明的膜，在视觉系统中非常重要。

4.Particularly the front of the eye, the cornea and the sheet that covers the cornea was particularly damaged.

尤其是眼睛前部，角膜和盖在角膜上面的那层薄片，严重受损。

5.Infection of the cornea (keratitis).

角膜感染(角膜炎)。

6.Doctors have long known that amantadine treatment causes abnormal changes in the cornea in some Parkinson's patients.

医生们早就知道金刚烷胺在一些帕金森病人身上能够导致角膜功能异常。

7.These lenses cover not only the cornea, like a regular contact, but also the surrounding area.

该隐形眼镜不仅覆盖普通隐形眼镜也覆盖的角膜，而且还覆盖角膜周围组织。

8.What you see: There's a whitish-colored ring along the outer edge of your cornea.

现象：你的角膜的外缘有一个白圈。

9.Ocular herpes occurs when the cornea is infected with HSV. It is the most common infectious cause of blindness in the us.

眼睛单纯性庖疹是因为角膜感染了单纯疱疹病毒，是美国最常见的致盲性眼部感染。

10.Patients with a damaged cornea 角膜 may require a corneal transplant.

有损伤的角膜 cornea 的患者可能需要进行角膜移植手术。

11.A scratch on the cornea 角膜 can cause significant pain and discomfort.

对角膜 cornea 的划伤会导致明显的疼痛和不适。

12.The doctor explained that the cornea 角膜 is essential for focusing light onto the retina.

医生解释说，角膜 cornea 对于将光线聚焦到视网膜上是至关重要的。

13.The cornea 角膜 has no blood supply, receiving nutrients from tears and the aqueous humor.

角膜 cornea 没有血液供应，营养来自泪水和房水。

14.The cornea 角膜 serves as a barrier against dirt, germs, and other particles that can harm the eye.

角膜 cornea 作为防止污垢、细菌和其他可能伤害眼睛的颗粒的屏障。

作文

The human eye is a remarkable organ that allows us to perceive the world around us. One of its most crucial components is the cornea, which is the transparent front part of the eye. The cornea plays an essential role in our vision, as it helps to focus light onto the retina, enabling us to see clearly. In this essay, I will explore the structure and function of the cornea, as well as common conditions that can affect it and the importance of maintaining its health.The cornea is composed of five layers, each with its unique function. The outermost layer, known as the epithelium, acts as a barrier to protect the eye from dust, debris, and microorganisms. Beneath the epithelium lies the Bowman's layer, which provides additional strength and stability to the cornea. The third layer is the stroma, which makes up the majority of the cornea's thickness and is responsible for its shape and transparency. The fourth layer, Descemet's membrane, is a thin but strong layer that supports the endothelium, the innermost layer that regulates fluid levels within the cornea and maintains its clarity.The primary function of the cornea is to refract light, which means it bends light rays as they enter the eye. This bending of light is crucial for clear vision, as it helps to direct light onto the retina, where images are formed. Any irregularities or damage to the cornea can lead to vision problems, such as astigmatism or blurred vision. For example, if the cornea is too steep or too flat, it can distort the way light is focused, resulting in visual impairment.Several conditions can affect the health and functionality of the cornea. One common issue is keratitis, an inflammation of the cornea that can result from infections, injuries, or exposure to harmful substances. Symptoms of keratitis include redness, pain, and sensitivity to light, and if left untreated, it can lead to serious complications such as scarring or vision loss. Another condition is corneal dystrophy, a group of genetic disorders that cause the cornea to become cloudy or develop abnormal deposits, affecting vision.Maintaining the health of the cornea is vital for overall eye health. Regular eye exams can help detect any issues early on, allowing for timely treatment. Additionally, protecting the eyes from harmful UV rays by wearing sunglasses and avoiding contact with irritants can help preserve the integrity of the cornea. For those who wear contact lenses, proper hygiene and care are essential to prevent infections and other complications.In conclusion, the cornea is a critical component of the eye that significantly impacts our vision. Understanding its structure and function, as well as the potential conditions that can affect it, is essential for maintaining good eye health. By taking proactive measures to protect our eyes and seeking regular check-ups, we can ensure that our cornea remains healthy and functional, allowing us to enjoy the beauty of the world around us.

人眼是一个非凡的器官，使我们能够感知周围的世界。它最重要的组成部分之一是角膜，即眼睛前面的透明部分。角膜在我们的视觉中发挥着至关重要的作用，因为它有助于将光线聚焦到视网膜上，使我们能够清晰地看见。在这篇文章中，我将探讨角膜的结构和功能，以及可能影响它的常见疾病和保持其健康的重要性。角膜由五层组成，每一层都有其独特的功能。最外层被称为上皮层，起到保护眼睛免受灰尘、碎片和微生物侵害的屏障作用。在上皮层下面是Bowman膜，为角膜提供额外的强度和稳定性。第三层是基质，占据了角膜大部分的厚度，并负责其形状和透明度。第四层是Descemet膜，是一层薄而坚固的膜，支持内皮层，即最内层，调节角膜内的液体水平并维持其清晰度。角膜的主要功能是折射光线，即在光线进入眼睛时弯曲光线。这种光线的弯曲对于清晰的视觉至关重要，因为它有助于将光线引导到视网膜上，在那里形成图像。任何对角膜的不规则或损伤都可能导致视觉问题，例如散光或模糊视力。例如，如果角膜太陡或太平，可能会扭曲光线的聚焦方式，导致视觉障碍。几种情况可能会影响角膜的健康和功能。一种常见问题是角膜炎，这是角膜的炎症，可能由感染、损伤或接触有害物质引起。角膜炎的症状包括红肿、疼痛和对光敏感，如果不及时治疗，可能会导致严重并发症，如疤痕或视力丧失。另一种情况是角膜营养不良，这是一组遗传性疾病，导致角膜变得模糊或出现异常沉积，影响视力。保持角膜的健康对于整体眼睛健康至关重要。定期进行眼部检查可以帮助及早发现任何问题，从而及时治疗。此外，通过佩戴太阳镜保护眼睛免受有害紫外线的伤害，并避免接触刺激物，可以帮助保持角膜的完整性。对于佩戴隐形眼镜的人来说，适当的卫生和护理对于预防感染和其他并发症至关重要。总之，角膜是眼睛的一个关键组成部分，对我们的视觉影响重大。理解其结构和功能，以及可能影响它的潜在疾病，对于保持良好的眼睛健康至关重要。通过采取积极措施保护我们的眼睛并定期进行检查，我们可以确保我们的角膜保持健康和功能正常，使我们能够享受周围世界的美丽。