BAGPIPES: Seeking DD hydrogel contact lens wearers

Seeking daily disposable contact lens wearers aged 17-60. Sleeping or napping in contact lenses limits the amount of oxygen reaching the eyes, making the cornea (front of the eye) swell more than it would during waking hours. In this study, we want to simulate sleeping in contact lenses by placing an eye patch over one eye that is wearing a contact lens during waking hours to measure the amount of swelling that occurs.

About the study

If eligible, you will be asked to follow the study instructions and attend the following visits:

  • Visit 1 (DAY 1) – Screening and study measurements – 2.75 hours
  • Visit 2 (DAY 2) – Baseline assessment and lens dispense – 1.25 hours
    *3 hour wait time between Visit 2 & 3 with eye patch covering one eye*
  • Visit 3 – Lens removal after 3 hr wait time and measurement taken (same day)
  • Visit 4 – Measurement taken after 0.5 hr from removal (same day)
  • Visit 5 – Measurement taken after 1 hr from removal (same day)
  • Visit 6 – Measurement taken after 2 hr from removal (same day)
  • Visit 7 – Measurement taken after 3 hr from removal then study exit (same day)
    *Visits 3-7 will take 4.5 hours

Total time commitment 11.5 hours over 2 days

The visits will include standard clinical procedures that you might encounter when you attend an eye exam.

What are the requirements?

  • To be eligible for this study, you must meet the following criteria:
  • Must be between 17-60 years of age
  • Have proof of eye examination within the last 2 years
  • Prescription between +4.00 and -8.00
  • No previous history of overnight contact lens wear
  • Have worn either spherical hydrogel or spherical silicone hydrogel contact lenses for the past 3 consecutive years with wearing daily disposable contact lenses of the same material type (hydrogel or silicone hydrogel, respectively) currently and at least in the past 6 months. 
  • Are currently not pregnant or nursing a child
  • Have NOT undergone eye surgery
  • Have a habitual contact lens wear schedule of at least 8 hrs a day, 5 days a week
  • Have a wearable pair of spectacles


In appreciation of the time involved, you will receive up to $230. Parking passes will be provided as required.

Safety during COVID-19

We want to let you know that we have revised several of our protocols to keep participants and researchers safe during the pandemic, including enhanced cleaning and mandatory wearing of masks by everyone. Measures we have taken to reduce the risk of exposure to COVID-19 are explained in an “Information Letter: COVID-19 Risks for In-Person Research Study Visits” which we will ask you to sign in the event you participate.

Please note that you will be within 2m (6 feet) of the researcher during some or most of the study visit time.  At all times, the furthest possible distance will be maintained.

Please note, if you are aged 60 and above, you are considered at a greater risk for severe illness from the COVID-19 virus.

How to participate

If you are interested in participating, please create a volunteer profile at the link below and we will contact you with more information. If you are already a registered CORE volunteer, please email and mention the study name BAGPIPES. You will be provided with all relevant study information prior to study enrollment and you are under no obligation to participate.


Time Commitment

Start Date

End Date