The Human Eye and Defects

The Human Eye and Defects

The human eye is the important organ of the human body that helps to see a vision. The defects of human eyes like Myopia, Hypermetropia, and Presbyopia affect vision.

There are different types of eye diseases that create problems for the human body. Through the discussion of different types of defects, explanation is going to help in understanding the seriousness of those diseases. Moreover, among the significant ones for disease such as myopia is a person who fails to see distant objects clearly. Human eye defects like hypermetropia lead a person to lose power to see nearby objects whereas Presbyopia happens due to ageing of a person under consideration of serious defects in the eye.

The Human eye and Defects

According to the study, human eyes have played an important role to a person in seeing objectives in the environment. The human eye works according to light reflection. The human eye has a retina that helps to project the reflection of the objects. After this process, a human becomes able to see objects. The approximate size of the human eye is 24.2 mm (transverse) × 23.7 mm (sagittal) × 22.0-24.8 mm (axial). The eyeball of a person varies between 21 to 27 mm sizes. Infection in the eyeball creates a problem in seeing any objects for human beings where proper treatment is required. On the other hand, Vitamin deficiency is a common factor for eye problems where specific vitamin consumption is important for human beings to avoid the defects. Chemical presence in human eyes creates irritation where humans face problems to see objects. Additionally, continuous contamination of chemicals in human eyes could be a reason for the loss of power of human eyes. 

A cataract is another defect of the eyes that happens due to ageing where a person fails to see a portion of objects. In this case, doctors go for an operation where the chance of success rate is not impressive.  

Explanation of reason behind defects in the human eye 

Human eye defects are being oriented with three types of diseases: myopia, Hypermetropia, and Presbyopia which are going to be explained in this context. Reasons for myopia are the excessive curvature in the ball that causes this type of defect. Moreover, elongation of the human eyeball is also a reason behind those defects. Myopia or shortsightedness gets increased by focusing on nearby products for a long time where a person loses the ability to see distant objects. Hypermetropia defects are also known as far-sightedness where a human being has the ability to see distant objects but the ability to see nearby objects becomes less. 

In the context of Presbyopia, a defect has arisen due to ageing where a person fails to focus on nearby and distant objects. Prescribing eyeglasses helps humans to see objects. 

Symptoms of those eye defects

The myopia defect is commonly known as near-sightedness where a person is able to focus on nearby objects but faces problems seeing long-distance objects. In the context of Hypermetropia defects, a person’s eyeball becomes too small, which is the reason for losing the ability to see nearby objects. Additionally, the focal length of the eye lens becomes long, which raises the problem of focusing on nearby objects. Presbyopia raises the problem of seeing closer and distant objects equally.

Correction of those defects

Correction of those defects are tried to be described in this section where the correction approach helps human beings become able to see objects. In the context of myopia, defects could be corrected by the concave lens with suitable power. Through this correctional approach concave lens with suitable power helps to back the image on the retina that reflects the proper image to a human. Therefore correction of this defect by this approach helps humans to see nearby and distant objects. 

Hypermetropia defects could be corrected by using eyeglasses with appropriate strength. The convex lens used for eye defects can help a person’s ability to see nearby objects with comfort. Through the use of the additional lens formatting proper images on the retina generates the ability to see nearby objects. 

Presbyopia defect creates problems for close and distant objects where bifocal lenses help humans to increase their ability to see nearby and distant objects equally. The bifocal lens consists of concave and convex lenses that reflect the image of both objects equally on the lens as per the requirement that helps to mitigate this defect.


It can be concluded that human eyes have different types of defects where the most common three defects have been described in this study. Different reasons for eye defects have been described to prevent those defects.  Presbyopia defects happen due to ageing that could be controlled by any human. But other defects could be controlled by humans by maintaining minimum use of digital devices. Those defects are considered serious problems for human beings because those defects are increasing due to ignoring treatment. Eyeglasses with appropriate strength are prescribed by registered doctors to help see the proper image of objectives