at approximately 16 \(\mathrm{mm}\) in front of the cornea. (Since the distance of the retina to the eye lens is roughly \(22 \mathrm{~mm}\) and the refractive index of the vitrous humor is \(1.337\),...at approximately 16 \(\mathrm{mm}\) in front of the cornea. (Since the distance of the retina to the eye lens is roughly \(22 \mathrm{~mm}\) and the refractive index of the vitrous humor is \(1.337\), this implies a focal distance in air of the unaccomodated eye of \(22 / 1.337 \approx 16 \mathrm{~mm}\) ). Contact lenses are very close to the eye lens and hence the total power of the eye with a contact lens is simply the sum of the power of the eye and the contact lens.
