The question of whether one must wear eyeglasses before transitioning to contact lenses is common for those seeking vision correction. The decision to pursue contacts is independent of prior glasses use, but it initiates a specific clinical process. While a vision problem must first be identified and assessed, there is no medical requirement to wear glasses before a contact lens fitting can be performed. The necessary step is obtaining a specialized prescription tailored for lenses that rest directly on the eye’s surface.
The Requirement for a Prescription, Not Glasses
Prior glasses use is not necessary, but a current, valid prescription is mandatory. Contact lenses are classified as medical devices, requiring a prescription from a licensed eye care professional, even for cosmetic lenses. The prescription for eyeglasses and the one for contact lenses are not interchangeable due to the difference in their placement relative to the eye.
Eyeglasses sit approximately 12 to 14 millimeters away from the cornea, a measurement known as vertex distance, which affects the power needed for vision correction. A contact lens rests directly on the eye, eliminating this distance and often requiring a calculation to adjust the lens power, especially for stronger prescriptions exceeding +/- 4.00 diopters. The contact lens prescription must include unique specifications to ensure the lens is safe and effective on the eye’s surface.
Steps to Obtaining Your First Contact Lens Prescription
Obtaining a contact lens prescription involves a specialized fitting process that goes beyond a standard eye exam for glasses. This initial phase includes a comprehensive eye health check and a measurement of the refractive error to determine the lens power. The eye care professional must then collect specific data points to ensure the lens fits the unique contours of the eye.
Keratometry is one of the most important measurements taken, as it precisely maps the curvature of the cornea. This measurement dictates the base curve of the contact lens, which must closely match the eye’s shape for a comfortable and stable fit. The eye professional also measures the iris and pupil size to determine the correct lens diameter. An evaluation of tear film health is conducted to assess for conditions like dry eyes, which influences the selection of lens material and water content.
Based on these clinical measurements, the eye care specialist selects a trial lens for an in-person assessment. They observe the lens’s movement, alignment, and coverage to confirm the fit is correct and that the lens is not restricting oxygen flow or causing irritation. This trial period is followed by a vision check to finalize the power, base curve, and diameter, which together form the official contact lens prescription.
Mandatory Training for New Contact Lens Wearers
After the prescription is determined and trial lenses are approved, new wearers must complete training on handling and care, separate from the clinical fitting. This instruction is important because contact lenses are medical devices that require meticulous hygiene to prevent complications like eye infections or corneal ulcers. The training covers proper handwashing techniques, emphasizing the avoidance of soaps containing oils or moisturizers that can coat the lens surface.
Trainees receive hands-on guidance for insertion and removal techniques, practicing until they can safely and proficiently place and take out the lenses without assistance. The instruction also includes the necessary care regimen, covering how to properly clean, disinfect, store, and discard the lenses according to the prescribed wearing schedule. This practical education ensures the wearer understands the importance of adhering to the recommended schedule to maintain long-term eye health.