There are over thirteen eye diseases ranging from the common, easily treated and not too serious Dry Eye condition to the very rare Neurotrophic Keratitis, whose treatment is very expensive indeed. You will have heard of mascular degeneration, common in the elderly; glaucoma and cataracts.
The latter can be treated easily and painlessly these days. Retinal Detachment is serious and requires surgery. Blindness is a condition with different causes rather than a disease.
It is the exhaust from vehicles that causes most problems to eyesight. Public alarm is most often voiced over the adverse effect upon breathing, but hydrocarbons and nitric oxide in ambient air cause irritation to the eyes especially when exposed to such air pollution for up to four hours. This is the case whatever the weather temperature.
Parents are wisest to ensure their children are in areas of heavy traffic for as short a time as possible for they will not be as aware as adults of the toxic atmosphere caused by heavy traffic. Lately, drivers of vehicles have become more responsible by switching off their engines when stationary.
Yes, it is possible for tap water to cause eye infections. It is contact lens wearers who are at risk. There is a microbe common in the environment including in tap water. Called acanthamoeba, it has two forms: the trophozoite and the cyst.
The trophozoiteis is infective. It can change into a cyst and survive long enough to stick to the surface of contact lenses and then infect the eye. There have been cases where eyesight has been severely damaged in this way.
Not particularly! Although eye irritation, tiredness and muscular pain can be eased by a warm compress (essentially a clean flannel or cloth soaked in warm water) the key word is WARM not hot. The holding of a warm compress is often soothing to painful areas of the body.
This is less often the case with eyes, where a cool compress may help. In any case don’t use boiling or very hot water. The skin on your eyelid and around your eye is thin and sensitive. It will not ease the condition and can burn easily.
It may seem surprising, but psychological stress can lead to vision problems. Stress can cause migraines which does affect vision, but a serious vision problem related to stress is central serous retinopathy. Stress is a physical, mental or emotional reaction caused by a change that interferes with the body’s equilibrium.
As such, vision can be blurred, or worse. Computer use is an increasing activity that is certainly a contributor to near point stress.
Yes, green is the rarest colour of human eyes, and it is most dramatic in North African people, probably because of its contrast with coffee coloured skin. Brown-eyed people are not that common, only 5.9% of the world population, but only around 2% has green colored eyes.
Green eye color occurs when there's a mild amount of pigmentation in the eye with a golden tint. It's thought it is caused by the migration of peoples from North to south.
The correct answer to this question is B.
Hazel eyes are due to a combination of Rayleigh scattering and a moderate amount of melanin in the iris' anterior border layer. Hazel eyes often appear to shift in color from a brown to a green. Although hazel mostly consists of brown and green, the dominant color in the eye can either be brown/gold or green. This is how many people mistake hazel eyes to be amber and vice versa.
This can sometimes produce a multicolored iris, i.e., an eye that is light brown/amber near the pupil and charcoal or dark green on the outer part of the iris (or vice versa) when observed in sunlight. Hazel eyes occur throughout Caucasoid populations, in particular in regions where blue, green and brown eyed peoples are intermixed.
Any reaction treatment should not be carried out so cannot be a consideration when choosing eye lash adhesive. Same goes for allergies and senitivity.
When kittens are born, they are born with their eyes and ears sealed shut, only able to use their noses to search for their mother and their siblings born in their litter. As kittens grow older, their ears open, followed by their eyes. When they kittens eyes finally open around day seven to ten, they are blue but will change to their life-long eye color shortly after.
Kittens are highly dependent upon their mother for the first few weeks, needing their mother to help them stay warm, be fed, and as protection against infectious disease. Once the kittens reach between six to eight weeks, the kittens are much more independent.