Powerpoint Presentation On Human Eye And Colourful World
Introduction→ Human eye: The sense organ that helps us to see.→ Located in eye sockets in skull.→ Diameter of eye ball – 2.3 cm.Parts of Human Eye. Cornea: It is the outermost, transparent part.
It provides most of the refraction of light. Lens: It is composed of a fibrous, jelly like material. Provides the focused real and inverted image of the object on the retina. This is convex lens that converges light at retina.
Iris: It is a dark muscular diaphragm that controls the size of the pupil. Pupil: It is the window of the eye. It is the central aperture in iris. It regulates and controls the amount of light entering the eye. Retina: It is a delicate membrane having enormous number of light sensitive cells.
Human Eye Ppt Presentation
Concave Lens
Free Powerpoint Presentation Templates Eye
Far point: The maximum distance at which object can be seen clearly is far point of the eye. For a normal adult eye, its value is infinity.Near point or Least distance of distinct vision→ The minimum distance at which objects can be seen most distinctively without strain.→ For a normal adult eye, its value is 25 cm.→ Range of human vision – 25 cm to infinity. Accomodation: The ability of the eye lens to adjust its focal length is called accommodation. Focal length can be changed with the help of ciliary muscles.→ Focal length increases when Ciliary muscles get relaxed and lens get thin.→ Focal length decreases when Ciliary muscles get contract and lens get thick.