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Keeping You in Sight
Keeping You in Sight
If you can see objects at a distance clearly but have trouble focusing well on objects close up, you may be farsighted. Your eye doctor may refer to farsightedness as hyperopia which is the medical term used to describe the condition. Hyperopia causes the eyes to exert extra effort to see close up. After viewing nearby objects for an extended period, you may experience blurred vision, headaches, and eyestrain. Children who are farsighted may find reading difficult. Being farsighted is not a disease and it does not mean that you have ‘bad eyes.’ It simply means that you have a variation in the shape of your eyeball. The degree of variation will determine whether or not you will need corrective lenses.
Hyperopia most commonly occurs because the eyeball is too short; that is, shorter from front to back than is normal. In some cases, hyperopia may be caused by the cornea having too little curvature.
Exactly why eyeball shape varies is not known, but the tendency for farsightedness is inherited. Other factors may be involved too, but to a lesser degree than heredity. Many people have a degree of farsightedness, yet it is only a problem if it significantly affects our ability to see well, or causes headaches or eyestrain.
How Farsightedness Affects Sight:
Our ability to ‘see’ starts when light enters the eye through the cornea. The shape of the cornea, lens, and eyeball help bend (refract) light rays in such a manner that light is focused into a point precisely on the retina.
If, as in farsightedness, the eyeball is too short, the ‘point of light’ focuses on a location behind the retina, instead of on the correct area of the retina, known as the fovea. As a result, at the point on the retina where a fine point of light should be focused, there is instead a disk-shaped area of light. Since light is not focused when it hits the retina, vision is blurred.
Convex lenses are prescribed to bend light rays more sharply and bring them to focus on the retina. If you do not have other vision problems such as astigmatism, you may only need glasses for reading or other tasks done at close range.
To determine the best avenue of treatment, your doctor may ask a number of questions about your lifestyle, occupation, daily activities, and general health status. For instance, you may be asked whether or not you frequently need near vision in your daily activities. Providing candid, considered answers to the questions and working with your eye doctor will help assure that your corrective lenses contribute to clear sight and general comfort.