Eyeglasses and contact lenses are both used for vision correction. Both of the options have their advantages and disadvantages but a number of factors like lifestyle, comfort and age etc. are important while deciding which one to choose. Here is a list of the fundamental differences between using spectacles and using contact lenses:
1. Distance from the cornea
Lenses are worn directly on the eye and are in constant physical contact with the cornea while glasses are worn over the eyes. Contact lenses may cause infections in the eye because the user has to touch the eye in order to wear them and to take them off.
2.Difference in vision
Since the lenses of the spectacles are a little distance away from the eye, vision can be slightly distorted but contact lenses can provide natural and accurate vision. Also, side vision is not improved by glasses as you have to turn your head to see what is beside you. The contacts move around with your eyeballs and the peripheral vision is in focus.
3.Ease of use
Some people find eyeglasses difficult to use because of the constant weight on the face and the obstruction caused by the frames of the glasses. There may also be a constant need to adjust the frames. Often eyeglasses slip down the nose when you sweat or engage in rigorous physical activity. Contacts are free from all these hassles- they not distracting or obstructive and so they are extensively used by dancers and athletes. Spectacles are very uncomfortable to wear during the rains or in humid weather because they fog up.
4.Infections and complications
Contact lenses can get displaced inside the eye and they can be difficult to reposition. They also cause the eyes to itch and water if you wear them for a very long time at a stretch or if tiny dust particles enter your eyes. The use of eyeglasses is far more flexible in this respect- they can be removed in case your eye itches or burns, but regular use of glasses causes dark circles and bags under the eyes.
People often prefer contact lenses as they do not change the physical appearance- they help you to look natural and you can also use coloured lenses to change the colour of your eyes. Glasses may look slightly unnatural but some people also prefer them for the fashion quotient.
The quality and sharpness of vision are generally measured with a Snellen chart. The Snellen chart shows letters of logically smaller size. Perfect vision is 20/20. This implies the patient or subject sees the same line of letters at twenty feet that a typical individual sees at twenty feet.
1. Eat right for good vision
Taking good care of your eyes begins with the food that you eat. Foods, for example, fatty acids, lutein, zinc and vitamins C and E may avert age-related vision and eyesight problems, for example, macular degeneration and cataract as shown by certain studies. Eating these foods daily can lead to healthy eyesight. Following are some of the nutrients that can help us do so:
2. Quit smoking
Smoking makes you more inclined to get a cataract, optic nerve damage and macular degeneration. The more times you attempt to stop smoking, the more probable you are to succeed.
3. Wear shades
The right sort of shades will shield your eyes from the sun's bright (UV) beams. An excess of UV exposure makes you more inclined to get cataracts and macular degeneration. Pick shades that piece ninety-nine to hundred percent of both UVA and UVB beams. Wraparound lenses shield your eyes from the side. Spellbound lenses diminish the glare when driving. Some of the contact lenses come with UV protection as well. It is still a smart thought to wear shades for more protection, however.
4. Turn away From the Computer Screen
Gazing at a computer screen for a really long time can bring about eye strain, foggy vision, trouble focusing at a distance, dry eyes. The muscles around the eyes can start getting weak and painful if given too much strain. Turn down the screen brightness. You need to at present have the capacity to see, however, you should not feel like you are gazing at a very bright light. In case you are reading from the computer, use the zoom capacity to make the content bigger.
5. Pencil exercise
Take a pencil, and place it someplace in the centre. Draw a letter, number or dot in on any side of the pencil. For this activity, you will concentrate on the pencil and the spot as you move it toward and far from your eyes. Pencil push-ups are rumoured to correct twofold vision and crossed eyes, yet it cannot hurt to attempt them for different issues since it is free, easy, and just includes focusing and refocusing your eyes.
Between myopia or short sightedness and hypermetropia or farsightedness, the latter is less common. However, this does not make it any less important. Farsightedness or long sightedness refers to a refractive error in the eye lens that creates problems focusing on objects nearby. This is because the light entering the eye does not converge on the retina but does so behind the retina.
Long sightedness can be caused by a number of factors. Some of these are:
Structural problems with the eye
Some people are born with structural problems. This is one of the leading causes of long sightedness. These structural conditions include:
1. A cornea that is not steep enough
2. A short eyeball
3. A flattened lense
4. A thicker than normal lense
Long sightedness rarely affects children. This is a condition that becomes noticeable after the age of 40 in most cases. With age the lenses in the eyes become stiffer and do not curve normally. This is known as presbyopia.
As with myopia, hypermetropia is also triggered by genetic faults. If someone in your family suffers from this then chances are that you will too. However, the specific genes that transfer this condition from one generation to the next have not been discovered as yet.
Not being able to read a book clearly is one of the most common symptoms of long sightedness. Some of its other symptoms are:
Long sightedness can be correctly diagnosed only with a thorough eye examination. Hence it is essential to schedule one regularly. This becomes more important as a person gets older. If left untreated, it can lead to double vision which in turn can trigger two possible eye problems.
This is a condition where the eyes get misaligned and hence do not work in tandem. People suffering from this condition find their eyes focusing on two independent objects instead of seeing the same thing.
Double vision can make one eye more dominant than the other. This makes the muscles of one eye degenerate at higher rate than the other making it lazy. This is known as amblyopia.