Plain English Summary
Background and study aims
Sodium hyaluronate (hyaluronate acid [HA]) eyedrops are used extensively in patients complaining of dry eye, including contact lens wearers. The aim of this study is to compare the effect of cross-linked HA to non-cross linked HA eyedrops on the tear film of contact lens wearers.
Who can participate?
Adults aged 18 and over who have healthy eyes and are currently wearing daily disposable contact lenses with discomfort/dry eye symptoms
What does the study involve?
The potential participants attend the clinic for Visit 1 to obtain their informed consent and evaluate their suitability to take part in the study. The potential participants are asked to come wearing their usual contact lenses that day. If the potential participant consents to taking part, measurements of visual acuity and ocular (eye) integrity are taken. If they fulfill the criteria for the study, they are scheduled to attend the test visits 2 and 3 (two to seven days later). Participants return for their two test visits having worn their usual contact lenses around six hours that day. During the test visits, a single drop of the first study eyedrop (randomly chosen) is instilled in each eye. Tests are performed before the eyedrop instillation, at multiple time points over a 3-hour period after eyedrop instillation and after lens removal. Tests include video recording of the tear film in one eye only and completion of questionnaires. At the end of each test visit, the participants’ eyes are examined for ocular integrity. Visit 3 follows the same routine as Visit 2, except that the eyedrop used is the eyedrop not used in Visit 2.
What are the possible benefits and risks of participating?
Participants may not directly benefit from taking part in this study but have the opportunity to try different eyedrops to manage their symptoms while wearing contact lenses. Both study eyedrops are CE marked eyedrops. 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 participants are current daily disposable soft contact lens wearers and wear their own contact lenses. The risks of taking part in the study are no greater than those associated with wearing their own contact lenses. All the tests are routine clinical procedures or specialized procedures and none present any increased risk to participants compared with normal clinical routine.
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?
November 2017 to January 2018
Who is funding the study?
CooperVision Inc. (USA)
Who is the main contact?
Ms Trisha Patel
Effect of sodium hyaluronate eyedrop on contact lens wettability
Despite having a new contact lens every day, a significant percentage of daily disposable contact lens wearers are still having discomfort/dryness (symptoms) towards the end of the day. Use of eyedrops may be beneficial and selecting the most appropriate formulation within a category of eyedrops will be important for long term success. The rationale for the study is that the sodium hyaluronate (HA) eyedrop formulation that achieves the best effect following a single instillation is likely to have the best long-term efficacy when managing symptomatic contact lens wearers. The purpose of the study will be to quantify the effect of cross-linked HA (test) compared to non-cross linked HA (control) on contact lens on eye wettability by evaluating the tear film characteristics in symptomatic lens wearers.
Hypothesis: cross-linked HA eyedrop produces a greater improvement than non-cross-linked HA eyedrop in tear film characteristics and the duration for the improvement.
North West - Liverpool Central Research Ethics Committee, 15/11/2017, ref: 17/NW/0659
Single-centre interventional single-arm double-masked (investigator and participant) randomized order (control and test) cross-over bilateral prospective study
Primary study design
Secondary study design
Randomised cross over trial
Patient information sheet
Not available in web format, please use contact details to request a participant information sheet.
Dry eyes, eyedrops, contact lens symptomatology, tear film
The potential participants will attend the clinic for Visit 1 to obtain their informed consent and evaluate their suitability to take part in the investigation. The potential participants will be asked to come wearing their habitual contact lenses that day. If the potential participant consents to taking part, measurements for visual acuity and ocular integrity will be taken. If they fulfill the inclusion and exclusion criteria, they will be enrolled and scheduled to attend the test visit 2 and 3 (two to seven days later). Participants will return for their two test visits having worn their habitual contact lenses around six hours that day. Participants will use the cross-linked HA (test) and non-cross linked HA (control) eyedrops in a randomized order. During the test visits, a single drop of the first study eyedrop (randomly assigned and masked) will be instilled in each eye in the clinic (in office use only) by unmasked study staff. Evaluations will be performed prior to the eyedrop instillation, at multiple time points over a 3-hour period after eyedrop instillation and after lens removal. Evaluations include tear film digital non-invasive video recording using the slit-lamp tearscope illumination in one eye only and completion of subjective questionnaires. At the end of each test visit, the participants’ eyes will be examined with a slit lamp biomicroscope for ocular integrity. Visit 3 will follow the same routine as Visit 2, except that the eyedrop used will be the eyedrop not used in Visit 2. Participants' eyes will be examined by the investigator before they leave the clinic and are discharged from the study at the end of Visit 3.
Primary outcome measure
Measured using Tearscope at study visit 2 and 3 at pre-instillation of eyedrop and 5, 30, 60, 90, 120 and 180 minutes post instillation:
1. Tear film non-invasive break-up time
2. Contact lens surface exposed area at blink
3. Contact lens surface tear film protective index
Secondary outcome measures
Measured at study visit 2 and 3 at pre-instillation of eyedrop and 5, 30, 60, 90, 120 and 180 minutes post instillation and prior to contact lens removal:
1. Subjective comfort, rated using 0-100 point Visual Analog Scale (VAS)
2. Subjective vision, rated using 0-100 point Visual Analog Scale (VAS)
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 symptomatic daily disposable 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. Have normal eyes with the exception of the need for visual correction
8. 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 20 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 contraindicated as determined by the investigator
3. Monocular participants (only one eye with functional vision) or participants fit with only one contact 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. Enrollment 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
The data sharing plans for the current study are unknown and will be made available at a later date.
Intention to publish date
Participant level data
To be made available at a later date
Basic results (scientific)