Understanding the Difference Between Eyeglass & Contact Lens Prescriptions

Many people assume that they have the same prescription for both eyeglasses and contact lenses. Typically, when you have a vision problem, eyeglasses are the first solution prescribed. During a visit to the ophthalmologist, a series of tests are conducted to determine the prescription needed for your eyes, and glasses are then prescribed accordingly.

However, after some time, you may find that eyeglasses are not as stylish as you'd like, or for other reasons, you may decide to switch to contact lenses. In such cases, when you visit an optometrist and request a pair of contact lenses, the salesperson often recommends undergoing an eye examination. If you're in a hurry, you might claim to know your prescription and provide it to them. Subsequently, you leave with a new pair of contact lenses.

Unfortunately, some people overlook the instructions for insertion and removal of contact lenses. Upon attempting to use them, they may find that the lenses are not as effective as their eyeglasses. Returning to the optometrist, they may complain that the contact lenses are ineffective, and at times, they may even perceive a worsening of their vision. The doctor reassures them that the prescription remains the same, leaving them puzzled.

It's important to understand that eyeglasses and contact lenses do not share the same prescription. When opting for contact lenses, a separate eye examination is required. Typically, eyeglasses have a higher prescription than contact lenses. This is because contact lenses sit directly over the cornea, while eyeglasses are positioned at a distance from the eyes, with an average distance of 12mm.

Determining a contact lens prescription involves different eye examinations compared to those for eyeglasses. It's a more intricate process, as it includes measuring the curvature and diameter of the cornea to prescribe the appropriate contact lenses based on these factors.

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Note: This blog is for informational purposes only and does not constitute medical advice. Always consult with clinicians before using this information.