<P> The cornea is the transparent front part of the eye that covers the iris , pupil , and anterior chamber . The cornea , with the anterior chamber and lens , refracts light , with the cornea accounting for approximately two - thirds of the eye 's total optical power . In humans , the refractive power of the cornea is approximately 43 dioptres . While the cornea contributes most of the eye 's focusing power , its focus is fixed . The curvature of the lens , on the other hand , can be adjusted to `` tune '' the focus depending upon the object 's distance . Medical terms related to the cornea often start with the prefix `` kerat - '' from the Greek word κέρας , horn . </P>
<P> The cornea is the transparent front part of the eye that covers the iris , pupil , and anterior chamber . The cornea , with the anterior chamber and lens , refracts light , with the cornea accounting for approximately two - thirds of the eye 's total optical power . In humans , the refractive power of the cornea is approximately 43 dioptres . While the cornea contributes most of the eye 's focusing power , its focus is fixed . The curvature of the lens , on the other hand , can be adjusted to `` tune '' the focus depending upon the object 's distance . Medical terms related to the cornea often start with the prefix `` kerat - '' from the Greek word κέρας , horn . </P>
the cornea is the transparent anterior part of the
the cornea is the transparent anterior part of the
eye that covers the iris , pupil , and anterior chamber
eye that covers the iris , pupil , and anterior chamber