Condition category
Eye Diseases
Date applied
Date assigned
Last edited
Prospectively registered
Overall trial status
Recruitment status

Plain English Summary

Background and study aims
The shape of the edge of the contact lens influences the way the lens fits on the eye and its comfort. Different contact lenses have got different edges. The aim of the study is to compare how the lens fits on the eye along with its comfort for different multifocal contact lenses with different edge designs.

Who can participate?
Adults who are least 40 years old, who have healthy eyes, who wear contact lenses and are starting to get longsightedness (near addition +0.75 to +1.25).

What does the study involve?
A single visit during which the participant will use the 3 study contact lenses each for 2 hours.

What are the possible benefits and risks of participating?
The participants are current contact lens wearers and they will use under the control of the investigator the 3 currently marketed contact lenses. The risks to the participant are no greater than wearing their own contact lenses. The risks will be further minimised by the fact that the contact lenses will only be worn in the clinic under the supervision of the investigators. The possible benefit to the participant will be to try different contact lenses with different levels of comfort that they could eventually purchase from their own practitioner.

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?
May 2020 to December 2020

Who is funding the study?
Cooper Vision Inc (USA)

Whi is the main contact?
Deborah Moore

Trial website

Contact information



Primary contact

Mrs Deborah Moore


Contact details

66 Buckingham Gate
United Kingdom
+44 (0)207 222 4224

Additional identifiers

EudraCT number

Nil known number

Nil known

Protocol/serial number

CV20-42 ID20-17, IRAS 281961

Study information

Scientific title

The effect of contact lens parameters and material on fitting characteristics - pilot study


Study hypothesis

Mechanical performance of contact lenses with a feather edge design is not inferior to that with a chisel edge design.

Ethics approval

Approved 04/05/2020, North West - Preston Research Ethics Committee (Barlow House, 3rd Floor, 4 Minshull Street, Manchester, M1 3DZ, UK; +44 (0)207 104 8056;, ref: 20/NW/020

Study design

Non dispensing prospective randomised (order of testing) cross over double-masked study

Primary study design


Secondary study design

Randomised cross over trial

Trial setting


Trial type


Patient information sheet

Not available in web format, please use contact details to request a participant information sheet


Presbyopia multifocal contact lens fitting


Each participant uses all 3 contact lenses in a random order for a 2 hour period, after which the contact lens fitting measurement and comfort measurement are being carried out.

1. Measurement of contact lens decantation (horizontal and vertical) from the centre of the pull (mm). The measurement to be performed in primary gaze and reading gaze.
2. Lens centration and lens movement classification on 5 point scale.
3. Contact lens comfort rating on 100 point VAS scale.

Intervention type



Not Applicable

Drug names

Clariti 1 day single vision contact lens
Clariti 1 day multifocal low addition contact lens
MyDay multifocal low addition contact lens

Primary outcome measure

Contact lens decentration is measured from high speed video taken after 2 h of wear

Secondary outcome measures

Measured after 2 h of wear:
1. Lens centration rating on a 5 point scale by investigator using a slit lamp biomicroscope
2. Lens movement rating on a 5 point scale by investigator using a slit lamp biomicroscope
2. Comfort rating by participant using a computer based 100 point VAS scale

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. At least 40 years old
2. Have read and understood the Participant Information Sheet in English
3. Have read, signed and dated the Informed Consent
4. Best corrected visual acuity of at least 20/25 in each eye
5. Have normal eyes with the exception of the need for visual correction
6. Current contact lens wearer
7. Spectacle refraction:
Distance: Sphere: -6.00D to + 4.00D
Astigmatism: 0.00DC to -0.75DC
Near Addition: +0.75D to +1.25D
8. Be willing and able to adhere to the instructions set in the clinical protocol and maintain the appointment schedule

Participant type

Healthy volunteer

Age group




Target number of participants


Participant exclusion criteria

1. Ocular anterior segment infection, inflammation, abnormality, or active disease that would contraindicate contact lens wear
2. Newly prescribed (within the past 30 days) use of some systemic medications (such as antihistamines, decongestants, diuretics, muscle relaxants, tranquilizers, stimulants, anti-depressants, anti-psychotics, oral contraceptives) or new prescription eyedrops which is not rewetting/lubricating eyedrops 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 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

Recruitment start date


Recruitment end date



Countries of recruitment

United Kingdom

Trial participating centre

Ocular Technology Group - International
66 Buckingham Gate
United Kingdom

Sponsor information


Cooper Vison Inc. (USA)

Sponsor details

6150 Stoneridge Mall Road
United States of America
+1 925 251 6682

Sponsor type




Funder type


Funder name

Cooper Vision (Inc) USA

Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

There are no specific plans for publication or dissemination of the study results. However, an abstract for submission at an ophthalmic conference and/or a peer-reviewed publication may be generated.

IPD sharing statement:
The current data sharing plans for this study are unknown and will be available at a later date.

Intention to publish date


Participant level data

Not provided at time of registration

Basic results (scientific)

Publication list

Publication citations

Additional files

Editorial Notes

25/06/2020: Internal review. 23/06/2020: Trial’s existence confirmed by North West - Preston Research Ethics Committee