The rental agencies determine the rules for that. Most rental companies will not rent to anyone under the age of 25. Some will rent to people 21 to 24 years old, but charge a premium rate. The only time I have ever heard of a rental car company renting to an 18-year old is to a member of the military.
1 The lens is a soft, transparent, spherical structure that is suspended within the eye, just behind the pupil. 2  The lens is responsible for focusing light coming in through the pupil onto the retina in the back of the eye.
OD is thus right eye. 1  The cornea is the outer cover of the eye's hole allowing light in. 2  The iris is the muscle that pulls the opening in the eye (the pupil) open (the coloured bit).  The lens is like an internal pair of glasses that focuses the light that comes through the cornea onto the retina.