THE HUMAN EYES & THE COLOURFUL WORLD || CLASS 10 PHYSICAL SCIENCE CHAPTER -7 IN ODIA || PART-2 ||

#ଦୃଷ୍ଟିଦୋଷ #humaneye #defectofvision #revolutioneducation #myopia #hypermetropia #presbyopia
There are three common eye defects, and they are(i) myopia or near-sightedness, (ii) Hypermetropia or far-sightedness, and (iii) Presbyopia. These defects are corrected by the use of suitable spherical lenses.
ସମୀପ ଦୃଷ୍ଟି (Myopia):
Myopia or Near-Sightedness
Myopia is commonly known as near-sightedness. In this condition, the person can see the objects nearby but cannot see distant objects clearly. Faraway objects appear blurry, and a person will not be comfortable seeing them. Myopia condition takes place when the shape of the eyes leads the light rays to bend in a wrong way, focusing images in front of the retina rather than focusing on the retina.
Correction : When a concave lens of suitable power is used, it assists in focusing the image onto the retina.
ଦୂର ଦୃଷ୍ଟି(Hypermetropia) :
Hypermetropia or Far-Sightedness
Hypermetropia is commonly known as far-sightedness. In this condition, the person can see objects at a distance but cannot see nearby objects clearly. Usually, the person with this disorder squints to see nearby objects. Hypermetropia is caused when the light rays from a closeby object are focussed at a point behind the retina.
Correction : Using spectacles with a converging lens imparts additional focusing power and thus helps form the image on the retina.
ଚାଳିଶା(Presbyopia)
Presbyopia
We know that along with age, the power of the accommodation factor to adjust the focal length also decreases. People have difficulties viewing nearby objects clearly without the assistance of corrective eyeglasses. This condition is referred to as presbyopia. Presbyopia happens when the ciliary muscles weaken and diminish the elasticity of the eye lens. Presbyopia can be seen in people above the age of 40 years.
Correction : This condition can be corrected by using proper eyeglasses or contact lenses. Minor surgery also helps in restoring the vision with better clarity. Advancement in technology has made it easy to correct the refractive defects with contact lenses or through surgical interventions

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