The human eye, it is the most valuable and sensitive sense organ which help us to see the beauty and the colorful world around us. It is similar to a camera. We all have been gifted with two eyes which gives a wider field of view.
Structure of a Human Eye
The eye is spherical in shape and has a diameter of 2.3 cm on an average. The internal structure of the eye includes- cornea, iris, pupil, lens, ciliary muscles, retina, nerve cells, optic nerve, and yellow spot, aqueous and vitreous humor, and suspensory ligament.
For More Information On Human Eye and Its Structure, Watch The Below Videos:
To know more about Structure of a Human Eye, visit here.
Defects of a Human Eye
There are few common eye disorders seen in all individuals and are caused by several factors. These conditions can be improved by the corrections. The defects include:
Myopia – This is also called as the short-sightedness. A person with this eye defect can only see the nearby objects clearly compared to distant objects. This condition can be corrected using a concave lens.
To know more about Myopia, visit here.
Hypermetropia – This is also called as the farsightedness. A person with this eye defect can only see the distant objects clearly compared to near objects. This condition can be corrected using a convex lens.
To know more about Hypermetropia, visit here.
Presbyopia – This is an age-related condition caused due to the weakening of ciliary muscles, hardening of the lens, and reduced lens flexibility. A person with this defect usually finds difficulties to focus on nearby objects unable to read or write.
Cataract – This is an age-related condition caused due to the loss of transparency of the lens by erosion of lens proteins. It usually results in blurry vision, cloudy lenses and can be corrected by replacing the old lens with an artificial lens.
For More Information On Defects Of Vision And Their Correction, Watch The Below Video:
Few Important Questions
- What is Tyndall effect?
- What is Myopia and Hypermetropia?
- Explain in detail about Newton’s prism experiment.
- Explain why do stars twinkle and why the planets do not twinkle.
- Explain the structure and function of a human eye with a neat labelled diagram.
For More Information On Refraction of Light and Scattering of White Light by a Glass Prism, Watch The Below Videos:
Access Notes of CBSE Class 10 Science all Chapters here.
Learn more about the human eye from the topics given below:
|The Human Eye||Eye Defects: Myopia|
|Structure And Functioning of a Human Eye||Eye Defects – Hypermetropia Or Hyperopia|