Vision Defects and Eye Conditions

Snow blindness or the inflammation of cornea of the eye is caused by a high dose of UV-B radiation.

Ocular herpes is a contagious viral infection of the eye. Ocular herpes is the same strain of herpes that causes a cold sore--completely different from the sexually transmitted form of herpes. The Digital Journal of Ophthalmology from Harvard Medical School states that there are approximately 500,000 cases of ocular herpes treated every year in the United States. Symptoms include blurred vision, tearing and eye pain.

Glaucoma is caused by increased intraocular pressure that damages the optic nerve. Cataract (A) is lens clouding, conjunctivitis (C) is eye membrane inflammation, and ophthalmic neonatorum (D) is infant eye infection. The pressure build-up in glaucoma can lead to vision loss if untreated.

The most common form of color blindness is red-green color blindness, where red is perceived as yellow. People with this condition have difficulty distinguishing between red and green, often seeing red as a yellowish-brown shade. This is due to missing or defective red-sensing cones in the retina.

Graves' disease is an immune system disorder that results in the overproduction of thyroid hormones (hyperthyroidism). Ophthalmopathy due to thyrotoxicosis does not involve the uveal tract.

Rose Bengal is a stain. Its sodium salt is commonly used in eye drops to stain damaged conjunctival and corneal cells and thereby identify damage to the eye. The stain is also used in the preparation of Foraminifera for microscopic analysis.

Macular degeneration causes loss of vision.

Yes, it is correct. It is the defect of eye, due to which an old person cannot read and write comfortably.

Yes, it is correctly matched. Convex lens is used to treat hypermetropia. Concave lens is used to treat myopia. Cylindrical lens is used to treat astigmatism.

Yes, colour blindness is the defect of the eye due to which a person is not able to distinguish between certain colours. It can be any, varying person to person.

cones

 Short-sightedness  can be corrected by the use of concave lenses.

Short-sightedness (myopia) occurs when the eyeball is elongated (too long) or the cornea is too curved. This causes light to focus in front of the retina instead of on it. The iris controls pupil size, muscles control lens shape, and the retina is the light-sensing layer - none are the primary cause of myopia.

The most common type of color blindness is red-green color blindness (protanopia/deuteranopia). People with this condition cannot distinguish between red and green wavelengths. The other color pairs listed are not typically confused in common color blindness conditions.

Tritanopia is a very rare colour vision disturbance in which there are only two cone pigments present and a total absence of blue retinal receptors. Blues appear greenish, yellows and oranges appear pinkish, and purple colours appear deep red.