| Anatomical Part or Condition | Description | Function or Characteristic | Associated Vision Defect | Corrective Measure | Source |
|---|---|---|---|---|---|
| Myopia (Near-sightedness) | A refractive defect where a person can see nearby objects clearly but cannot see distant objects distinctly. | Image of a distant object is formed in front of the retina; the far point is nearer than infinity. | Excessive curvature of the eye lens or elongation of the eyeball. | Concave lens of suitable power. | 1 |
| Hypermetropia (Far-sightedness) | A refractive defect where a person can see distant objects clearly but cannot see nearby objects distinctly. | Image of a nearby object is focused behind the retina; the near point is farther than 25 cm. | Focal length of the eye lens is too long or the eyeball has become too small. | Convex lens of appropriate power. | 1 |
| Presbyopia | A refractive defect arising due to ageing and the gradual weakening of ciliary muscles. | The near point gradually recedes away (beyond 25 cm) due to a decrease in the power of accommodation. | Weakening of ciliary muscles and diminishing flexibility of the eye lens. | Bifocal lenses (concave upper part and convex lower part) or contact lenses. | 1 |
| Ciliary Muscles | Muscles that surround and hold the eye lens in position. | Modifies the curvature of the eye lens to change its focal length, enabling the power of accommodation. | Presbyopia (due to gradual weakening of the muscles). | Bifocal lenses. | 1 |
| Cornea | A thin membrane forming a transparent bulge on the front surface of the eyeball. | Most of the refraction for light rays entering the eye occurs at its outer surface. | Corneal blindness. | Corneal transplantation. | 1 |
| Retina | A delicate, light-sensitive membrane located at the back of the eye. | Contains an enormous number of light-sensitive cells; forms an inverted real image and generates electrical signals for the brain. | Not in source | Not in source | 1 |
| Iris | A dark muscular diaphragm located behind the cornea. | Controls the size of the pupil. | Not in source | Not in source | 1 |
| Pupil | A central opening in the eye regulated by the iris. | Regulates and controls the amount of light entering the eye. | Not in source | Not in source | 1 |
| Cataract | A condition where the crystalline lens becomes milky and cloudy, typically at an old age. | Causes partial or complete loss of vision. | Loss of vision due to lens opacity. | Cataract surgery. | 1 |
Welcome to our diverse and dynamic course catalog.
Orporate clients and leisure travelers has been relying on Groundlink for dependable safe, and professional chauffeured car end service in major cities across World.
