Hard contact lenses, also known as Rigid Gas Permeable (RGP) lenses, are made from durable, oxygen-permeable plastic polymers. They are often prescribed for clear vision correction, particularly for astigmatism or irregular corneal shapes. While the idea of a “hard” lens might suggest discomfort, RGP lenses are designed to be comfortable once the eyes adapt, and initial sensations are temporary.
Initial Experience and Adaptation
When first wearing RGP lenses, a “foreign body sensation” is common, similar to having an eyelash in the eye. This occurs because RGP lenses are rigid and smaller than soft lenses, moving slightly with each blink over the cornea. Unlike soft lenses that conform to the eye’s shape, RGP lenses maintain their own shape, resting on the tear film that lubricates the eye. This initial feeling is a normal part of adaptation and does not indicate damage.
The adaptation period for RGP lenses typically ranges from a few days to a few weeks. During this time, eyes gradually adjust to the lens presence and movement. Eye care professionals often recommend a gradual increase in wearing time, starting with a few hours a day and slowly extending it. With consistent wear, initial discomfort usually lessens or disappears, leading to comfortable, sharp vision.
Reasons for Ongoing Discomfort
Discomfort with RGP lenses that extends beyond the normal adaptation period or develops suddenly can stem from several factors. Improper fit is a common cause. A lens that is too tight can restrict tear flow and oxygen to the cornea, while a loose lens may move excessively, causing friction. Both scenarios can lead to irritation, pain, and even corneal abrasions.
Foreign particles, such as dust, lint, or debris, can become trapped under the lens, causing significant and immediate discomfort. The rigid nature of RGP lenses means they do not conform around these particles, leading to sharp pain. Dry eyes, characterized by insufficient tear production or rapid tear evaporation, can also lead to friction between the lens and the eye surface, resulting in irritation and discomfort.
Damage to the lens, such as chips, scratches, or cracks, can directly irritate the eye. Persistent pain may signal more serious underlying issues like corneal abrasions or infections, which require immediate professional attention. Allergic reactions to lens solutions or environmental allergens can also cause eye irritation and discomfort.
Managing and Preventing Discomfort
Proper lens care and handling are important for managing and preventing discomfort with RGP lenses. Always wash and thoroughly dry your hands before touching your lenses to avoid introducing contaminants. Following strict cleaning and storage instructions from your eye care professional is also important to prevent infections and maintain lens integrity. Never use tap water for rinsing or storing lenses, as it can introduce harmful microorganisms.
Regular eye examinations and lens checks are necessary to ensure lenses continue to fit properly and to monitor eye health. An eye care professional can assess lens fit, check for any corneal issues, and make adjustments as needed. For individuals experiencing dryness, rewetting drops specifically formulated for RGP lenses can provide lubrication and alleviate discomfort. These drops help recondition the lens surface and can extend comfortable wearing time.
If you experience severe or persistent pain, redness, blurred vision, or discharge, remove your lenses immediately. Contact your eye care professional for an evaluation, as these symptoms could indicate a serious condition like a corneal abrasion or infection. Ignoring such symptoms can lead to more significant eye health problems.