Plain English Summary
Background and study aims
Dry eyes is a common condition that occurs when the eyes don't make enough tears or the tears evaporate too quickly,
leading to the eyes drying out and becoming red, swollen and irritated. It can be caused by wearing contact lenses. There are differences between contact lens wearers with and without dry eyes in the various tear components taken up by contact lenses. The difference can be detected after a single day of wear.The aim of this study is to collect contact lenses worn by wearers who have dryness symptoms versus those with no symptoms under controlled conditions for a period of 8 hours for analysis of tear components taken up by the contact lenses.
Who can participate?
Adults who are at least 18 and who have healthy eyes and currently wearing contact lenses
What does the study involve?
Participants' eyes are examined by the investigator and video recording and assessment of their tears is performed. At the next visit (1 to 27 days after the first visit), they are given a pair of commercially available study contact lenses to be worn for 8 hours that day. They are asked to complete a short contact lens symptom questionnaire after 2, 4, 6 and 8 hours of wear. At the end of the 8 hours contact lens wear, the study contact lenses are removed by the study staff and stored for analysis. The investigator assesses the health of their eyes and checks their vision. All participants undergo the same routine.
What are the possible benefits and risks of participating?
Participants may not directly benefit from taking part in this study. The examination and assessments of the front part of the eye are at no cost to participants and can be considered beneficial by documenting their current health status. All contact lenses have the potential of causing injury to the eye. Since they are wearing commercially available contact lenses for 8 hours at the clinic, the risks of participating in this study are considered to be similar to those of their normal contact lens wear.
Where is the study run from?
Ocular Technology Group - International (UK)
When is the study starting and how long is it expected to run for?
September 2017 to December 2017
Who is funding the study?
CooperVision Inc. (USA)
Who is the main contact?
Ms Trisha Patel
Tear component uptake by contact lenses: symptomatic vs asymptomatic wearers
The hypothesis will be that symptomatic and asymptomatic contact lens wearers will exhibit differences in their tear film properties.
National Research Ethics Committee - South West - Exeter, 13/09/2017, ref: 17/SW/0160
Single-arm open-label bilateral prospective study with investigator masking
Primary study design
Secondary study design
Non randomised study
Patient information sheet
Not available in web format, please use the contact details to request a participant information sheet
Dry eyes, tear film
The etiology of contact lens dry eye has been traditionally reported to be due to excessive evaporation associated with an abnormal lipid layer, however, recent work indicates that the problem is more complex. In this study a further aspect of interest will be to identify the type of anomaly associated with the symptomatology. The study population will comprise of 50 participants: symptomatic (test group) 25 participants and asymptomatic (control group): 25 participants. The two groups will be matched for gender (12 males and 13 females in each group) because of the potential for difference in symptomatology with gender. Baseline pre-corneal tear film, tear prism digital video recording and tear film evaporimetry will be performed. All participants will wear the same type of study contact lenses under controlled conditions in the clinic for a period of 8 hours. They will be asked to complete the contact lens symptomatology questionnaire after 2, 4, 6 and 8 hours of wear. Worn contact lenses will be collected at the end of wear, stored and analyzed. Their eyes will be examined by the investigator before they are discharged from the study.
Primary outcome measure
1. Subjective comfort, rated using a 100-point Visual Analog Scale (VAS) after 2, 4, 6 and 8 hours of wear
2. Tear film components, analysed from worn contact lenses at the end of the day
Secondary outcome measures
Contact lens tear film biophysical properties (pre-corneal tear film, tear prism digital video recording and tear film evaporimetry) measured at baseline visit
Overall trial start date
Overall trial end date
Reason abandoned (if study stopped)
Participant inclusion criteria
1. At least 18 years old
2. Have read and understood the Participant Information Sheet
3. Have read, signed and dated the Informed Consent
4. Current spherical daily contact lens wearer
5. Spectacle refraction: Distance: Sphere: -6.00D to + 4.00D; Astigmatism: 0.00D to -0.75D
6. Best corrected visual acuity of at least 20/30 in each eye
7. Symptomatic wearers (test group):
7.1. At least three hours difference between daily wearing time and comfortable wearing time
7.2. Classified as symptomatic as per study criteria
8. Asymptomatic wearers (control group):
8.1. At most two hours difference between daily wearing time and comfortable wearing time
8.2. Classified as asymptomatic as per study criteria
9. Have normal eyes with the exception of the need for visual correction
10. Be willing and able to adhere to the instructions set in the clinical protocol and maintain the appointment schedule
Target number of participants
A total of 50 participants will be enrolled
Participant exclusion criteria
1. Ocular anterior segment infection, inflammation, abnormality, or active disease that would contraindicate contact lens wear
2. Use of systemic or ocular medications for which contact lens wear could be contraindicates as determined by the investigator
3. Monocular participants (only one eye with functional vision) or participants fit with only one lens
4. Any moderate or severe ocular condition observed during the slit-lamp examination at the enrolment visit
5. History of herpetic keratitis, ocular surgery or irregular cornea
6. Known pregnancy or lactation during the study period
7. Enrolment of the investigator or his/her staff, family members of the investigator, family members of the investigator’s staff, or individuals living in the households of these individuals
8. Participation in any clinical trial within 30 days of the enrolment visit
Recruitment start date
Recruitment end date
Countries of recruitment
Trial participating centre
Ocular Technology Group - International
66 Buckingham Gate
Funding Body Type
Funding Body Subtype
Results and Publications
Publication and dissemination plan
The protocol has not been published and is not available online. Publication of the results will depend upon the sponsor’s decision.
IPD sharing statement
All of the individual participant study data collected during the trial for all the required study variables (incl. tear film videos/photos) listed in the protocol will be stored in the OTGi server located at 66 Buckingham Gate, London. Participants are referred to by participant number and not name; however, initials and date of birth will be recorded on the study documents. A dedicated server is used and the hardware is firewalled and is protected by antivirus software. The database is backed up daily and encrypted onto an external device. This encrypted data is then mirrored remotely to an external offsite location. Participants are advised that their data are being collected for research purposes and may be used for additional scientific research, educational purposes and publications. Information will be encoded in order to safeguard their confidentiality, and if the results of the research are used in reports of the study or for any presentations, their identity will remain confidential. Any study information which is transferred to the sponsor will be fully anonymised and neither the participant’s identity or date of birth will be transferred; they will only be referred to by their participant number. Participants are provided with all of the information relating to their confidentiality and how their data may be used in the Participant Information Sheet and provide written consent for this.
Intention to publish date
Participant level data
Stored in repository
Basic results (scientific)