Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co.
We had to wait 5 to 10 minutes for a table, only to find out that the restaurant was less than half full. I had to question him about whether I was supposed to also get salad (which the menu said was included).
In order to fixate on a near object, the ciliary muscle contracts around the lens to decrease its size.
The suspensory ligaments relax and the radial tension around the lens is released.
The pupil constricts in order to prevent diverging light rays from hitting the periphery of the retina and resulting in a blurred image.
The ciliary muscles are responsible for the lens accommodation response Convergence is the ability of the eye to simultaneously demonstrate inward movement of both eyes toward each other.Changes in contraction of the ciliary muscles alter the focal distance of the eye, causing nearer or farther images to come into focus on the retina; this process is known as accommodation.A near object (for example, a computer screen) appears large in the field of vision, and the eye receives light from wide angles.For example, geometrical optics show that as a distant object is brought closer to the eye, the focus of the object becomes blurrier in the plane behind the retina; however, as a result of the increase in the refractive power of the eye, this image becomes clear.The refractive power mainly resides in the cornea, but the overall refractive power is achieved by the actual lens changing its shape.
This causes the lens to form a more spherical shape achieving a higher level of refractive power.