aperture leaf bladeIris

Iris - aperture leaf oakley australia bladeIris - aperture leaf blade. If the optical fiber is excessively strong, in iris pupil sphincter contraction, then the pupil reduces; The optical fiber weakens, the iris opens the greatly myo- contraction, the pupil fill-out. According to the iris content pigment's difference, the iris presents the different color. The caucasian iris pigment compares Few, assumes the cold color; The person of Asian descent pigment are many, assumes the yellowish brown color; The black pigment are most, assumes the black.
The scierotic - cabinet, plays the protective function to eyeball's internal structure, the white is not transparent, thick approximately 1 millimeter, behind hold entire eyeball approximately 5/6 scope. Is named the sclera, is approaches cornea's scierotic and above transparent ball conjunctiva.Eye's work process is approximately this; Nature each kind of object reflects the light and shade different optical fiber under the optical fiber line's illumination, these optical fibers through the cornea, the crystalline lens isostructuralism's refraction, focus on the retina, on retina's visual cell produces one The series electrochemistry change, pulls into the oakley australia sunglasses photic stimulation extension the nerve impulsion, through the visual circuit conduction to cerebrum's visual main center, completes the visual function. In the above process, the pupil may adjust enters in eyeball's optical fiber; Crystalline lens also through control action, guarantee light marking gauge Focuses firmly on the retina, thus obtains a complete clear physical image.In the eye complex complex structure, the crystalline lens are easiest to damage, when the eye looks at the thing, optical fiber through crystalline lens adjustment focusing on retina yellow spot. If through the adjustment, the optical fiber cannot focus on the retina, has the ametropia. The optical fiber focusing is regarding Before the net interface, is called the nearsightedness; Focusing after the retina is called the hyperopia; Cannot focus in a spot, is called the astigmatism. If crystalline lens' adjustment function being out of balance, if is old time, the crystalline lens cannot change raised, is called always regards, namely presbyopia; If the crystalline lens change mix Muddy, is called cataract.
Are different with our body's many organizations, the eye had problems difficultly to restore, like diseases and so on common nearsightedness, on are very easy, but restored may too be difficult!Good, the elementary knowledge speaks of here, the introduction eye's structure which here takes great pains, is to let everybody know, besides each oakley sunglasses cheap kind of construction machinery, our humanity himself is a great project miracle, sometimes, appreciates the outside world with it, The might as well to understands us!