Welcome to Dr William Boothe Site
Iris
The iris is the colored part of the eye. The muscles of the iris act to control the size of the pupil.
Pupil
The pupil is the opening that appears as a black spot in the center of the iris. The pupil acts to regulate the amount of light that enters the eye. In bright sunlight it becomes small to let in less light. In a dark environment the pupil expands to allow more light to reach the retina.
Lens
The crystalline lens is a normally clear structure located behind the pupil. It acts to fine tune the focusing. By changing shape, the lens allows us to focus near and far. This ability to focus near (accommodation) gradually worsens with age as the lens gets harder and less supple. Most people notice this in their early forties, at which time they begin to need reading glasses or bifocals. In people over sixty, the lens may become cloudy. This clouding of the lens is called a cataract and may interfere with your vision.
Vitreous
This is the clear gel substance that fills the space between the lens and the retina. If there are opacities in the vitreous, you may see them as “floaters.”
Retina
The retina is the thin layer of nerve tissue that lines the inside wall of the eye. It is very similar to film in a camera and functions to capture and transmit images for interpretation to the brain.
Optic Nerve
The optic nerve carries the images from the retina to the brain.
Refractive Errors
Refractive errors (vision-focusing problems) refer to disorders that are related to how your eye focuses light. The word refraction is used to describe the way light is bent by your eye. The factors that influence how your eye refracts (bends) rays of light are the curvature of your cornea, the power of your lens, and the length of your eye.