StemCell Therapy

Myopia

Myopia (nearsightedness) causes a person's near vision to be clear, while distance vision is blurry. Myopic individuals often squint, may complain of headaches and may have complaints of eyestrain. Myopia is often detected between the ages of six and 20, and can progress as time goes on.

Light rays, which are meant to reach the macula, actually converge too soon, causing a blur on the macula. The light-bending properties of the eye are too strong, converging light at a point before the retina. This may result from the corneal surface being too steep or from the actual length of the eye being too long. Myopes wear either contact lenses or glasses with minus (concave) power to weaken and diverge light rays. This pushes the focus of light rays back to the retina. Myopia often becomes worse during the growing years. If you detect a problem with your eyes, make sure you call for an appointment today.

Astigmatism is a refractive error, which distorts vision both at distance and near. The corneal surface is spherically shaped (similar to a ball). When the shape of the cornea is sphere-cylindrical (like a football), it is known as astigmatism. This causes the light rays to reflect unevenly inside the eye. While some light rays focus on the retina, other light rays focus in front of or behind the retina, resulting in blurred vision. Patients with astigmatism may wear glasses or contact lenses, which provide more power to the other section. Contact lenses required to correct the astigmatism are termed toric lenses; the fit of these is more complex. If you are experiencing blurred vision, make an appointment today.

Hyperopia (farsightedness) is complex to understand because in people under the age of 40, there is a compensatory mechanism to help bring images into focus. A patient may have no symptoms or just complain of eyestrain or headaches while reading. Light rays that reach the macula converge at a point behind the retina. The light-bending property of the eye is too weak; either the corneal surface is too flat or the actual length of the eyeball is too short.

Depending on the degree of hyperopia, patients need either contact lenses or glasses with convex power to aid in the convergence of light. This pulls the focus of light onto the retina. In low or moderate levels of hyperopia, the crystalline lens can change its shape to add more plus power to the eye. The change of shape and power of the crystalline lens is referred to as accommodation. In high levels of hyperopia, accommodation cannot add enough power to compensate, thus glasses or other forms of correction are needed. A complete eye exam will determine your true level of farsightedness.

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This entry was posted on June 28, 2015 at 11:43 pm and is filed under Eye Sight & Vision. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed. |