Condition category
Eye Diseases
Date applied
Date assigned
Last edited
Prospectively registered
Overall trial status
Recruitment status
No longer recruiting

Plain English Summary

Background and study aims
It is important for patients to provide informed consent prior to undergoing a medical treatment. Informed consent means that patients understand the purpose, benefits, and risks of the treatment. New methods of presenting informed consent, such as using video assistance, multimedia presentations and education classes have been studied in order to try to improve patients understanding and satisfaction with their medical treatments. In ophthalmology (a branch of medicine that looks at eye diseases), effects of different presentation methods on patients’ understanding have most commonly been investigated within the IC process of cataract surgery. Research has shown that providing video-assistance for IC has improved the understanding and satisfaction of patients with IC processes. Video-assisted IC processes may also be beneficial for patients who are ametropic (where the eye cannot focus on distant objects) who are undergoing a treatment for this called refractive excimer laser therapy. The aim of this study is to improve patient’s knowledgeable refractive excimer laser therapy and evaluate patient’s satisfaction with the overall IC processes in order to empower patients to make well informed decisions about their treatments.

Who can participate?
Adults aged 18 and older who attend a consult for refractive excimer laser therapy.

What does the study involve?
Participants are randomly allocated to one of two groups. Those in the first group receive the standard informed consent process. This involves oral and written information about the treatment and a discussion with the ophthalmologist. Those in the second group receive informed consent through the help of video to present the information in addition to the standard informed consent process. Participants then fill out a questionnaire to assess their knowledge, satisfaction, anxiety levels and if the duration of the consultant was as expected.

What are the possible benefits and risks of participating?
Participants may benefit from feeling more empowered when they make an informed decision about treatment. There are no notable risks with participating

Where is the study run from?
Cantonal Hospital Lucerne, Eye Clinic (Switzerland)

When is the study starting and how long is it expected to run for?
January 2017 to January 2019

Who is funding the study?
Cantonal Hospital Lucerne, Eye Clinic (Switzerland)

Who is the main contact?
Dr Philipp B. Bänninger

Trial website

Contact information



Primary contact

Dr Philipp Baenninger


Contact details

Cantonal Hospital Lucerne Eye Clinic
Augenklinik Luzerner Kantonsspital 


Additional identifiers

EudraCT number number

Protocol/serial number


Study information

Scientific title

Effects of video presented information about excimer laser therapy on ametropic patients’ comprehension and satisfaction with the informed consent process: A randomized controlled trial


Study hypothesis

1. Patients’ knowledge about excimer laser therapy will be more in the intervention compared to the non-intervention group
2. Patients’ satisfaction with provided information will be higher in the intervention (video-based information) compared to the non-intervention (conventional oral information) group
3. Anxiety levels will not defer between intervention and non-intervention group
4. Perceived contact time will be higher in the intervention compared to the non-intervention group

Ethics approval

Not provided at time of registration.

Study design

Single-centre open randomized parallel controlled trial

Primary study design


Secondary study design

Randomised parallel trial

Trial setting


Trial type


Patient information sheet

Not available in web format, please use the contact details below to request a patient information sheet


Excimer laser treatment for ametropia


Potentially eligible participants treated at the refractive centre of the cantonal hospital Lucerne (LUKS) are informed about the existence of the study by their treating ophthalmologist. During an initial consultation, the ophthalmologist ask if a the participant is interested in participating in the study. Participants are asked to give written informed consent for study inclusion and usage of clinical data.

Participants are randomised either to the non-interventional group (verbal conventional informed consent) or to the interventional group (verbal and video-assisted interventional informed consent) prior to their refractive excimer laser therapy. The randomisation is pre-stratified for age (under 38 years versus older than 38 years), due to the management and expectations of participants approaching the phase of presbyopia might slightly differ. Randomisation is done using “REDCap” in a 1:1 allocation into the non-/intervention group respectively. The randomisation is not blinded.

Non-interventional group: Participants receive a standard consultation for informed consent done to the standard level of care. This involves information about the treatment in oral and written form. The informed consent process includes information about benefits, risks, adverse events of and reasonable alternatives to refractive excimer laster therapy. In addition, ophthalmologists address individual factors of a specific patient that might affect therapy outcome. Finally, ophthalmologists answers patients’ remaining uncertainties and clarify ambiguities.

Interventional group: Participants receive a verbal and video-assited informed consent process. This includes standardised oral information about refractive excimer laser therapy exchanged by a video. Similar to the non-interventional group, standardised information about the intervention in written form is also provided. Ophthalmologists also address individual factors of a specific patient that might affect therapy outcome and answer patients’ formerly unanswered questions.

After the consultation, all participants are asked to fill out a paper-based questionnaire, assessing knowledge, satisfaction, anxiety levels and if the duration of the consultation (contact time between ophthalmologist and patient) was as expected.

Intervention type



Drug names

Primary outcome measure

Patients knowledge is measured using five multiple choice questions with five statements after the consultation.

Secondary outcome measures

1. Patients’ satisfaction is measured using a questionnaire after the consultation.
2. Anxiety levels is measured using a subpart of the State-Trait Anxiety Inventory 42 after the consultation.
3. Perceived contact time measured using a questionnaire after the consultation.

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Patients assessing refractive excimer laser therapy for ametropia at the refractive centre of the LUKS will be evaluated at their initial visit for study inclusion
2. Signed written informed consent form

Participant type


Age group




Target number of participants

43 paricipant in each trial arm respectively.

Participant exclusion criteria

1. Inability to follow the procedures of the study due to i.e. language problems, psychological disorders, dementia etc
2. Aged < 18 years
3. Enrolment of the investigator, his/her family members, employees and other dependent persons

Recruitment start date


Recruitment end date



Countries of recruitment


Trial participating centre

Cantonal Hospital Lucerne, Eye Clinic
Augenklinik Luzerner Kantonsspital Spitalstrasse Schweiz

Sponsor information


Canonal Hospital Lucerne Eye Clinic

Sponsor details

Eye Clinic
Augenklinik Luzerner Kantonsspital

Sponsor type

Hospital/treatment centre



Funder type

Hospital/treatment centre

Funder name

Cantonal Hospital Lucerne, Eye Clinic

Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

Planned publication in an high-impact peer reviewed journal.

IPD sharing plan:
The datasets generated during and/or analysed during the current study are/will be available upon request from Professor Lucas Bachmann (

Intention to publish date


Participant level data

Available on request

Basic results (scientific)

Publication list

Publication citations

Additional files

Editorial Notes

22/09/2017: Internal review.