Can I sleep with my contact lens on?

Few terminology for further understanding.

  • Oxygen transmissibility (DK/t) – the ability of lens to allow oxygen move from the anterior to the posterior surface
  • Equivalent oxygen percentage (EOP) – oxygen at the surface of cornea
  • Oedema – an increase in fluid content of tissue; swelling
  • Silicone hydrogel lenses – extended wear contact lens that allows higher oxygen transmissibility

Standard reading for Equivalent Oxygen Performance (EOP)

  • Atmosphere – 20.9%
  • Avoid oedema during close eye – 10% (Dk/t 24.1)
  • No overnight swelling – 18% (Dk/t 81)

Contact lens wearer MUST NOT sleep with normal hydrogel lenses as the DK/t value is not sufficient.

Instead, silicone hydrogel lens wearer could sleep or take a nap with the lenses on. Theoretical recommendation; You may leave your silicone hydrogel lenses in your eyes for maximum a week, unless a follow-up by your eyecare practitioner is done to ensure you are a suitable candidate. Otherwise, recommended to remove your lenses every night before going to bed.

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