A colonoscopy is a common screening procedure used to examine the lining of the large intestine for abnormalities such as polyps or signs of cancer. Patients often have logistical questions, including whether it is safe to wear contact lenses during the procedure. Understanding the environment and the effects of sedation is key to making the safest choice for the eyes.
Immediate Risks of Contact Lens Use
Patients should remove their contact lenses before a colonoscopy. The primary concern is corneal drying and discomfort while under sedation. The procedural environment, often involving dry, temperature-controlled air, exacerbates this issue. Reduced blinking or prolonged eye closure while resting can cause lenses to adhere to the cornea.
When a soft lens dries out, it can tighten and potentially cause a superficial corneal abrasion, leading to pain and blurred vision upon waking. If a lens causes irritation during the procedure, medical staff cannot easily intervene without interrupting the process. Removing contacts beforehand protects the integrity and hydration of the eye’s surface.
Procedural Necessity for Removal
The medical reason for removal centers on the effects of sedative medication. Sedation suppresses the body’s natural reflexes, including the involuntary blink reflex, which keeps the cornea lubricated.
This lack of blinking leads to extreme drying of the tear film and the contact lens material. Medical personnel also need an unobstructed view of the patient’s face and eyes to monitor for subtle signs of distress, such as changes in pallor or pupil response. Contacts could mask these signs or complicate monitoring. Furthermore, if contacts are forgotten and left in place for an extended period, they could cause serious damage to the cornea.
Vision Correction Alternatives
The safest alternative for vision correction during a colonoscopy is to wear prescription glasses. Glasses can be easily taken off immediately before the procedure and stored safely, without any risk of corneal damage. This allows the patient to see clearly while navigating the facility for check-in and recovery.
If a patient chooses to wear contacts until the last minute, they should use daily disposable lenses, which must still be removed and discarded before entering the procedure room. Patients should bring a contact lens case, fresh solution, and a case for their glasses. Contact lenses should only be reinserted once the patient is fully awake, alert, and discharged from the recovery unit.