May 18th 2021
Posted by Accuspire
Prism Lenses For Eye Glasses
These lenses are made up of thin optical pieces material in prescription glasses. The apex is thinner in size and the base is thicker in size. It has light bending properties and the light is slowed down when it reaches the base. This is the reason why the light changes its directions when it reaches the base and exits the prism. This depends on the difference in refraction index of the lens material along with the air. It also changes depending on the thickness and shape of the lens. If the base is thicker, more light will bent.
To produce ultra thin lenses, higher index material is used. This also ensures a comfortable wear and is also light weight. Consistent thickness lenses cannot change the light direction but it slows down the light. The prism effect can also be achieved by moving the lens centre off the visual axis. This is done in higher spectacle prescriptions compared to lower prescriptions.
They are prescribed to eliminate eye strain and diplopia. They are also prescribed for strabismus. Strabismus is a condition in which the eyes turn in or out, up or down. They also can turn laterally or vertically. This condition results in double vision, affecting the lifestyle. People, who are born with strabismus, do not have the risk of double vision as the brain shuts the vision in one eye. The lazy eye does not develop vision fully and is permanently affected. Double vision also causes nausea and headache. Double vision can also result in stroke and diabetes.
Because of this, it is important to change the prescription glasses to adjust the prism amount. It is also use to correct heterophoria. Consult your doctor to know more about these lenses.
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