HUMAN EYE
- The human eyes are the most valuable and sensitive organs responsible for vision.
- They are the gateway to the wonderful world.
Structure of the eye
- The eyeball is approximately spherical in shape with a diameter of about 2.3 cm.
- It consists of a tough membrane called the sclera, which protects the internal parts of the eye.
Important parts of the human eye are
Cornea:
- This is the thin and transparent layer on the front surface of the eyeball.
- It is the main refracting surface. When light enters through the cornea, it refracts or bends light onto the lens.
Iris:
- It is the coloured part of the eye.
- It may be blue, brown or green in colour.
- Every person has a unique colour, pattern and texture. Iris controls the amount of light entering the pupil like a camera aperture.
Pupil:
- It is the centre part of the Iris. It is the pathway for the light to the retina.
Retina:
- This is the back surface of the eye. It is the most sensitive part of the human eye, on which real and inverted image of objects is formed.
Eye Lens
- It is an important part of the human eye. It is convex in nature.
Ciliary muscles
- The eye lens is fixed between the ciliary muscles.
- It helps to change the focal length of the eye lens according to the position of the object.
Also Read
- Nature of universe / பேரண்டத்தில் இயல்புகள்
- General Scientific Law / பொது அறிவியல் விதிகள்
- Electricity and Electronics / மின்னியல் மற்றும் மின்னணுவியல்
- Elements and Compounds / தனிமங்களும் சேர்மங்களும்
- Carbon / கார்பன்
- Nitrogen and their compounds / நைட்ரஜன் மற்றும் அதன் சேர்மங்கள்
- Fertilizer / உரங்கள்
- Pesticides / களைக்கொல்லி
- Insecticides / பூச்சிக்கொல்லி
- Blood and blood circulation / இரத்தம் மற்றும் இரத்த சுழற்சி மண்டலங்கள்
- Endocrine system reproductive system / நாளமில்லா சுரப்பி மண்டலம், இனப்பெருக்க மண்டலம்