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myopia: FAQ

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This FAQ search page is a listing of the most frequently asked questions about "myopia". A great place to start getting answers to all your basic "myopia" questions.

What is Myopia?

Myopia or nearsightedness is the inability to see objects clearly at a distance. Myopia occurs when a person's eyeball is elongated or their cornea is too curved. In both cases, light rays entering the eye fall short of the retina instead of focusing clearly on the retina, which is what occurs with normal vision. Symptoms of myopia may include blurry vision, headaches, and eyestrain.
Myopia is commonly know as nearsightedness. Distance vision will be blurry, while the near vision will remain clear.
Myopia is often referred to as "short-sightedness" or "near-sighted". An eye is myopic when the "far point"; a point at which light from an object is focussed on the retina, is located at a finite distance in front of the eye. Myopia can be due to either an eye which is too long relative to the optical power of the eye (axial myopia), or because the optical power of the eye is too high relative to the length of the standard eye (refractive myopia). ...
Myopia, or nearsightedness, is an inherited condition in which the light rays entering the eye focus in front of the retina instead of directly on the retina. This occurs because the cornea, or front of the eye, is too steeply curved or the eye itself is too long. When a patient has myopia, near objects can be seen clearly, while distant objects appear blurry or even indistinguishable. Myopia, which affects 25% of the world’s population, usually begins in childhood and stabilizes in the late teens or early twenties.
A The common term for myopia is nearsightedness. It is an inherited, and sometimes stress-related condition which occurs when the eyeball is too long, or the cornea is too curved resulting in the inability to see at a distance.

What causes myopia?

A disproportionate increase in size of eye ball as compared to its power leads to myopia. Myopia most often occurs because the eye ball is too long. Some times myopia can occur if the cornea is too curved. There is some evidence that myopia may also be cause by excessive close work. Rarely a child may be born with high myopia. Top
A disproportionate increase in size of eye ball as compared to its power leads to myopia. Myopia most often occurs because the eye ball is too long. Some times myopia can occur if the cornea is too curved. There is some evidence that myopia may also be cause by excessive close work. Rarely a child may be born with high myopia.

How is Myopia diagnosed?

A diagnosis of Myopia can be made only after a basic eye examination performed by an ophthalmologist or an optometrist. The initial diagnosis of Myopia is usually made by having the patient read letters from an eye chart. Other tests are performed to determine the degree of Myopia.
Myopia is often suspected when a teacher notices a child squinting to see a blackboard or a child perform poorly during a routine eye screening. Headache or sitting too close to TV or reading from close distance may also point to poor vision and myopia. A comprehensive eye examination will detect myopia. Periodic examinations should follow, after myopia has been discovered, to determine whether the condition is changing once diagnosed, vision of child needs to be assessed every four to six months till the age of twenty.

What is myopia or nearsightedness?

People with myopia can usually read without glasses, but they cannot see far away without glasses or contact lenses. Myopia is a hereditary condition in which the eye is either longer than it should be, or the cornea has too much curvature.
If you are nearsighted, you cannot see things clearly in the distance. Objects seem fuzzy, muddled and/or blurry. As light enters the eye’s cornea (clear front portion of the eye), it travels through the lens where it is focused on the retina (back portion of the eye). In the myopic, or nearsighted eye, light rays are focused in front of the retina because the eye is too long. In order to correct this condition, the cornea must be made less steep or flatter, thus causing light to be focused on the retina.

What is Nearsightedness (Myopia)?

Myopia occurs when the eyeball is slightly longer than usual. This causes light to focus in front of the retina. Objects up close are clear, while objects at a distance are blurry.
Nearsightedness, or myopia, is a vision problem experienced by up to one-third of the population. Nearsighted people have difficulty reading highway signs and seeing other objects at distance, but can see for up-close tasks such as reading or sewing. Myopic people often have headaches or eyestrain, and might squint or feel fatigued when driving or playing sports. If you experience these symptoms while wearing your glasses or contact lens, you may need a comprehensive eye examination. ...
Children who are "nearsighted" see objects that are close to them clearly, but objects that are far away are unclear. Nearsightedness is very rare in infants and toddlers, but becomes common in school-age children. Eyeglasses help to clear the vision but do not "cure" the problem. Despite using glasses, near-sightedness will generally increase until the child reaches the mid-teens. Hence a periodic follow-up examination by an ophthalmologist is recommended.

What are myopia, hyperopia and astigmatism?

Patients with myopia, or nearsightedness, have steep curvature in one or both corneas; they can focus on nearby objects, but distant objects appear blurry. For hyperopic or farsighted patients, shallow corneal curvature causes nearby objects to appear blurry while objects in the distance are clear. Astigmatism causes objects that are close or at a distance to appear blurry or doubled. Most people have some degree of astigmatism, which often occurs in combination with myopia or hyperopia.

Is myopia preventable?

We believe that the answer is yes. If children use reading glasses for reading and other close work as soon as the first signs of nearsightedness appear, myopia can be prevented.

What is Myopia (short-sightedness)?

The usual cause is that your eyeball is too big: rather like a tennis ball compared with a golf ball! The cornea is the transparent window over the front of the eye. It is even more important than the lens in focusing light on the visual layer (retina) which lines the back of the eye. In Myopia light is focused in front of the retina.

How can Myopia be prevented?

There is no way to prevent Myopia. Avoiding eyestrain, reading and studying in a well-lit room, and taking breaks when working in front of a computer screen or doing nearsighted work may help. Eye health can be supported by the following: Eating a healthy diet that is rich in vitamins A and C Protecting the eyes from excessive amounts of ultraviolet light by wearing sunglasses when outside Drinking adequate fluids to prevent dryness in the eye Protecting the eyes when working with hazardous or caustic substances ...

Is there a correction for myopia?

Fortunately, optical correction for ordinary myopia is simple and effective. Eyeglasses or contact lenses can be custom-made to perfectly compensate for the excess optical power. Once you have corrective glasses or contacts, it is up to you how much time you wear them. The decision will be based on your own need for clear distance vision (as long as the correction is in front of your eyes, light rays entering the eyes will be properly focused on the retinas). ...

What is night myopia?

This is a condition of the eye which cannot see well at long distances in low illumination, such as driving at night. It's a myopic condition induced from complex optical factors as a result of dilatation of the pupil and reaction in the focusing mechanism of the eye. This problem can be alleviated by appropriately increased the correcting power to be used in the low illumination.

What is Short-sightedness (myopia)?

It causes problems with distant objects but close objects are very clear. Short-sightedness occurs when the eyeball is slightly longer than normal.

Why reduce my myopia?

To benefit from a better vision, possibly perfect, without glasses or contact lenses during the day for mild to moderate myopias. For a substantial reduction of severe myopias. For a more effective control over progressive myopias in chidren. For recreational, athletic or professional occupations that require better vision.

How is myopia treated?

Corrective concave lenses are prescribed to help focus light more precisely on the retina, where a clear image will formed. Concave lenses are thin in the centre. The lenses may be worn as spectacles or as tiny dises worn on the cornea as contact lens. If the degree of impairment is slight, corrective lenses may be needed only for activities that require distance visionm such as driving, watching TV or sports requiring fine vision.

Is there any myopia research in Hong Kong?

Our department has been carrying out myopia research studies for over ten years and recently we have established a " Centre for Myopia Research ". You may visit the webpage of this centre to obtain more information about myopia research in Hong Kong.

What are the risk factors of Myopia in children?

While the exact cause of Myopia remains unknown, it is believed that an interaction of heredity and environment may play a role. It tends to run in families. When both parents are nearsighted, their children have a greater than average chance of developing Myopia. Environmental factors such as reading in dim light or doing excessive amount of nearsighted work may contribute to Myopia.

What is myopia (shortsightedness)?

There are diffrent forms of myopia. The form that concerns most (young) myopes is axial myopia where the eye ball is too long relative to the refractive power of the cornea and the cristalline lens. As a consequence the image plane falls in front of the retina and the image appaers blurred. Another form of myopia is refractive myopia. In this latter type of short sightedness a normal eye can become myopic due to an increase of refractive power of the cornea or the cristalline lens as is found in certain eye diseases. ...

What is myopia or shortsight?

Myopia is a focusing error (‘refractive error’), and not an eye disease. A myopic eye can be thought of as an eye that is too large for it’s focusing power. People with myopia will tend to have blurred distance vision, but some clear near vision. There is currently no ‘cure’ to stop myopia occurring. Current thinking on myopia is that it is partly genetic, and partly environmental. There is a school of thought that believes myopia can be induced in certain susceptible individuals, by a predominantly near-work environment. ...

Can CK treat myopia (nearsightedness)?

The goal of CK is to help people with presbyopia see near objects more clearly. If you have myopia, you already see near objects clearly, but have trouble seeing objects in the distance. People with myopia need their cornea flattened and CK is designed to increase the curvature of the cornea. Effective treatment options for myopia include LASIK and RLE .

What is the emotional nature of myopia?

Myopia is a contraction and withdrawl from the world. Myopia is about not trusting what one sees, and about seing the world through a fear filter. Myopia often indicates a lack of security in ones self and in general trying too hard to acheive and to see. Myopia is also about being more critical, analytical, judgemental and having excessive attention to detail. The lenses of myopes are negative and make myopes feel negative. ...

How much myopia can LASIK correct?

There are differing opinions about the highest degree of myopia that can be corrected with LASIK, but it is Dr. Grandon's opinion that the highest is -15 diopters. Over that, with LASIK, there have been reports of glare with night driving.
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