| |
| Nothing in the world can replace the enchanting
pleasure a person derives from the act of seeing. Eyes are the preliminary
source of learning and leisure. Nowadays, people are paying greater
attention to retain the health of their eyes. Eye care is a way of
telling yourself I CARE. |
|
| The preliminary step in eye care is examining
whether you suffer from any visual impairment. |
| Calling on an ophthalmologist is the first
step towards this. But before that a basic of the retina, because
of understanding of the visual process and malfunctions is mandatory.
The eyes can be compared to a camera where the eyeballs are its lens
and the retina its screen. |
| In normal vision, the image falls on the
retina, the deviations of which are referred to as refractive errors
or Ametropia. Myopia, Hypermetropia, and Astigmatism paid a lot of
attention. are the general classifications of Ametropia. |
Click to enlarge |
If you can see objects at a distance clearly
but have trouble focusing well on objects close up, you may be farsighted.
Your eye care practitioner may refer to farsightedness as longsightedness,
or by its medical names, hypermetropia or hyperopia. Hypermetropia
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. |
| Hypermetropia is not a disease, nor does
it 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. |
| Hypermetropia most commonly occurs because
the eyeball is too short; that is, shorter from front to back than
is normal. In some cases, hypermetropia may be caused by the cornea
having too little curvature. |
Click to enlarge |
Myopia or near-sightness means that either
the eye is too long or the optics are too strong. In either case the
light from a distance object focuses in front of the retina. Minus
or concave lenses are used to move the image back on the retina when
viewing distance objects. |
| The vision may be corrected with glasses,
contact lenses or refractive surgery. Clearly if your parents are
nearsighted you have a better chance of becoming nearsighted. Identical
twins have similar refractive errors. |
| Myopia is much more common in people with
a higher education. There are those who claim that since people with
myopia can't see clearly at a distance, they become more interested
in things up close where they can see clearly, e.g. reading, computers. |
| The fallacy of this argument is that once
myopic patients are corrected with glasses or contact lenses, distance
vision is clear. Most myopia develops during periods of accelerated
growth (8-19). Previously myopia stopped by the early twenties. Today,
we see more myopia progressing in the late twenties or thirties in
those patients who spend a preponderous amount of time reading and
computer use. |
Click to enlarge |
If you experience a distortion or blurring
of images at all distances -- nearby as well as far -- you may have
astigmatism. Even if your vision is fairly sharp, headache, fatigue,
squinting and eye discomfort or irritation may indicate a slight degree
of astigmatism. |
| A thorough eye examination, including
tests of near vision, distant vision and vision clarity, can determine
if astigmatism is present. |
| Astigmatism is not a disease nor does it
mean that you have "bad eyes." It simply means that you
have a variation or disturbance in the shape of your cornea. |
| Astigmatism is one of a group of eye conditions
known as refractive errors. Refractive errors cause a disturbance
in the way that light rays are focused within the eye. Astigmatism
often occurs with nearsightedness and farsightedness, conditions also
resulting from refractive errors. |
|
|
