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Although glasses make life easier for those with near- or far-sightedness, they can be uncomfortable and a safety hazard for those who lead an active lifestyle. If you are looking for an alternative to eyeglasses, contact lenses are an excellent choice. They are small, pliable, and adhere directly to the eye without the need for external pieces.

When making the transition to contact lenses, many patients believe they can use the same prescription as they do for their glasses. But in reality, the prescription for a patient’s glasses and contacts are rarely the same. 

contact lensesThe prescription strength for glasses and contact lenses is measured in diopters, often written as “D” or “DS.” This abbreviation is typically accompanied by a positive number for hyperopia (far-sightedness) and a negative number for myopia (near-sightedness). Patients who transition from glasses to contacts often note a reduction in the strength of their prescription. 

The reason for this discrepancy is the proximity of the lens to the eye. Eyeglasses are usually worn about 12 millimeters from the eye, while contact lenses are placed directly on the tear film. Because contacts are so close to the eye itself, the prescription does not have to be quite as strong as it would be for glasses. In patients with stronger prescriptions, the discrepancy is typically much more significant.

Optometrists must also take exact measurements of the eye when determining a contact lens prescription—something which is not always required with glasses. Because contacts are meant to adhere directly to the eye, doctors must ensure the lens is the correct size and shape to remain in place without shifting. Some of these measurements include the base curve or shape of the cornea (BC), the diameter of the lens (DIA), and the oxygen permeability of the contact. Without these measurements, your contacts may not fit comfortably.

 

Knowing the correct prescription for your glasses and contact lenses is the best way to ensure your comfort and vision health. To get your prescription, turn to the optometrists at Staarman Family Vision Center in Fairfield, OH. These qualified doctors will work with you to ensure your eyesight is in top-quality condition. Give them a call today at (513) 874-1718 to schedule an appointment. For more information on their hours and eye care services, visit their website today.

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