Styplon
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GenericMed
- - Styplon 1 pc 2 bottles
- - Styplon 1 pc 2 bottles
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Tl-Pharmacy
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10-21 days/free
every country
MedRx-One
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LeadMedic
$41.98 - 2 bottles x 1 pc
$41.98 - 2 bottles x 1 pc
5-7 days/$25
every country
Pharma-Doc
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FedEx next day/$24
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Med-Pen
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7-14 days/$20
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OurPharmacyRx
$36.00 - 2 bottles x 1 pc
$156.00 - 12 bottles x 1 pc
5-12 days/$30
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RxPharms
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worldwide
RxMedShop
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5-9 days/$30
3-6 days/$40
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SENSE ORGANS: SENSE OF SIGHT
Although, without hearing, man is sadly cut off from natural communication with his fellows, there is pretty general agreement that sight is the most important sense which he possesses. The others are local, and even hearing is rarely of use except for sounds fairly close by. Sight allows us to appreciate things as far distant as the stars. It is with the greatest difficulty that we compensate for the loss of sight even with nearby familiar things.
Our sight is well guarded. The eyeball lies within the strong bony cavity or orbit and the nerve of sight is back of this, embedded in a soft mass of protective fat. The reaction of our eyelids is extraordinarily quick. Anything approaching the eyes causes them to close instantly, often even without our knowledge.
The delicate outer surface of the eyeball is kept continuously moist by a steady flow of salty tears from glands just above the eye. This washes away all fine dust that has not been caught by the eyelashes. Other glands in the upper eyelids secrete a fatty material that keeps the lids from sticking together and also keeps the flow of tears from running over. Most of this liquid evaporates but some runs through a small canal from the inner corner of the eye into the nose. Hence the blowing of the nose so common at plays, weddings, etc., when people do not want to admit their sentimental weeping.
This weeping is a peculiar phenomenon, peculiar to the human race. It is evidently a recent acquirement of human beings, biologically speaking. Babies do not weep until they are about two months old, and no other animal weeps, despite the references several centuries old to crocodile tears. It is an emotional affair – people weeping for joy as well as for pain and sorrow. It often gives physical relief from mental tension. And it is sometimes embarrassing.
The eyeball is a globe with an exceedingly tough wall and a front surface that must be the most delicate in the whole body. You may be barely able to see a speck after it is removed, although while under the eyelid it caused you anguish. The steady flow of tears saves you from many such unpleasant episodes.
As a piece of apparatus for receiving, transmitting, and recording light waves, the eye is much like a camera except in its shape. This globe shape allows the six muscles attached to its outer surface to move it like a ball and socket joint. They are fastened far enough forward so that they do not pull against the point of attachment but curve over the surface as a baseball pitcher’s fingers curve over the ball, giving a firm hold. Ordinarily the two eyes move together, thus keeping both focused on the object. Unfortunately some children have muscle trouble, resulting in a squint, and they cannot do this double focusing. Such children should be seen promptly by competent oculists, for many of them need the shortening or lengthening of one of these muscles.
Helmholtz, the great German scientist, said that he could design an apparatus for seeing which would be more efficient than the eye. Perhaps he could have made one for temporary use. But would it have worked well in bright sunlight, fairly well at night, also under water; would it have been kept in good order by home repair while still in use; would it have been fairly efficient after nearly a century of use and capable of developing pictures far more quickly than a modern Polaroid camera? Also could it have taken colored pictures under poor lighting conditions, carried an unlimited supply of films, and been capable of instant focusing for near or far distances?
Even with the eyelids closed there is enough transparency to allow us to distinguish between darkness and light, but the light rays which we really use for sight must come through the pupil. The size of the pupil is automatically regulated by the surrounding iris which consists of two muscles, one to open and the other to shut. These muscles act more quickly than any other involuntary muscles. The pupil enlarges when we look at distant objects, contracts for near ones. There is much more variation, however, produced by varying amounts of light. Bright lights cause small pupils. In the darkness of night the pupils become very large.
*57/276/5*
