Am I a Candidate?
Calgary Laser Vision Quiz
The best way to find out if you’re a candidate for Laser Vision Correction in Calgary is to visit us for a free consultation. To prepare for your visit, you can get an idea of what we look for by answering a few simple questions about your vision.
The Anatomy of the Eye
Around the iris is the sclera, or “white of the eye”. It connects to the cornea.
Behind the lens is a fluid-filled area called the posterior chamber. The retina is the surface that borders it in a large curve, extending almost to the ciliary muscle around the lens. The retina acts like film in a camera. It receives light from an image and converts that light into electrical impulses, which are sent through the fibers of the optic nerve to the brain.
The LensBehind the iris is the anterior chamber which is a cavity filled with fluid. Behind this lies the lens, the curvature of which is controlled by a circular muscle around it called the ciliary muscle. After the cornea admits light and bends it into focus, the lens bends it further, helping a person focus on things that are nearby or far away.
Internal FluidsThe anterior chamber, between the cornea and the lens, is filled with a fluid called aqueous humor, which bathes the lens, seeping around to its posterior side through small openings. The lens and cornea have no blood vessels and receive their nutrients from this aqueous fluid. The posterior chamber, between the lens and the retina, is filled with a fluid called vitreous humor. It is 99% water although it has a gel-like consistency. It is transparent to allow light through and helps to maintain the eye’s shape.
The CorneaThe cornea is a transparent surface that curves over the iris and pupil. It is the lens that bends incoming light to focus it at the back of the eye. During Intralase SBK, PRK and other forms of Laser Vision Correction, the corneal curvature is affected in order to correct vision defects. The cornea is part of the wall of the eye and connects with the sclera.
The Optic NerveNear the centre of the retina is an opening where the large optic nerve leaves the eye. Across the entire retina is a network of millions of tiny nerve fibers, each one connected to a single retinal cell. They pick up the electrical energy created by that cell from image information. They converge to form the optic nerve and leave the eyeball within a nerve sheath. The optic nerve runs to the brain’s vision center where the electrical energy it carries is interpreted by the brain.
Myopia, more commonly known as nearsightedness, occurs when an eye has too much focusing power. This means that the eyeball is either too long or the cornea is too steep, and the projected image falls short of the retina. The result is an improperly transmitted message to the brain or simply, a blurred image.