Although the eye is commonly referred
to as a globe, it is not really a true sphere. It is composed
of two spheres with different radii, one set into the other.
The front, or anterior, sphere is
the smaller and more curved of the two and is called the
cornea. The cornea is the window of the eye since it is a
completely transparent structure.
The posterior sphere is a white opaque
fibrous structure called the sclera. The cornea and the sclera
encase the eye and form a protective shell for all the delicate
The eye measures approximately 24mm
in all its main diameters in the normal adult.
'Vutest' analyses the various
functions of the eyes to standards recognised by many ophthalmic
authorities, and recommends that should any of the functions
fall below a good standard, you are referred to an optometrist
for expert advice.