Wearers of contact lenses have been reminded to take them out before going to sleep.
AsiaOne drew attention to the issue after speaking to Soo Chua, who would wear her contact lenses for 16 hours at a time and forget to take them out before going to sleep.
Stan Isaacs of the Singapore Contact Lens Society explained that poorly fitting contact lenses could also be bad for eye health.
He suggested silicone hydrogel contact lenses, which allow more oxygen to reach the eye.
Ms Chua found her eye problems improved dramatically after switching to this type of contact lens.
She had been waking up with blurred vision.
Contact lenses are generally very safe but must not be overworn and proper hygiene procedures need to be maintained.
Asia is reportedly seeing a rising demand for contact lenses.
by Emily Tait