STRUCTURE OF EYE 257 



Detailed structure. The eye is an elongated ball 

 about an inch in diameter, which is covered by a tough 

 coat made up of several membranes. The outer mem- 

 brane forms the white of the eye and covers it except in 

 front, where a transparent membrane, the cornea, per- 



Coniunctiva 

 Cornea 



Anterior chamber / 

 (aqueous humor # 



Jris 



Ciliary muscle 

 Suspensory ligament 

 Lens (vithln 



its capsule) 

 Tendon of 



friferna 

 i-ectus muscle 



Vitreous humor 



Optical axis 

 (line of vision) 



Layer of 

 nerve fibres 

 Retina 

 Choroid 

 Sclerotic coat 



Central Artery 

 Optic nerve 



FIG. 138. The right eye cut horizontally, viewed from above (somewhat diagram- 

 matic). 



mits light to enter it. After passing through the cornea, 

 the light enters a transparent liquid, the aqueous humor, 

 which fills the front of the eyeball. It then passes 

 through a hard transparent mass, the lens, into a stiff 

 jelly-like transparent substance, the vitreous humor, 



