Condition category
Eye Diseases
Date applied
Date assigned
Last edited
Retrospectively registered
Overall trial status
Recruitment status
No longer recruiting
Publication status
Results overdue

Plain English Summary

Background and study aims
In femtosecond laser-assisted surgery a laser is used to create tiny incisions in the eye through which the old cloudy lens or cataract is removed and the new lens is implanted. The system has recently been introduced into the European Union and clinical use is limited, so we are evaluating the use of this system.

Who can participate?
Adults (aged over 16) undergoing refractive lens or cataract surgery.

What does the study involve?
Data on the results of your surgery will be analysed. We will also carry out some additional tests before and after surgery to determine the health of your eyes.

What are the possible benefits and risks of participating?
The additional tests are all non-contact, non-invasive and involve no discomfort. It is likely to take a maximum of 1 hour of extra time to perform these. There is no additional charge for you to be part of the study. The measurements performed will be providing additional information about the health of your eyes. However, overall it is unlikely that you will benefit personally from helping with this research project, but the results of the research should be of benefit to the large number of patients in the future.

Where is the study run from?
Moorfields Eye Hospital (UK)

When is the study starting and how long is it expected to run for?
August 2012 to August 2013

Who is funding the study?
Investigator initiated and funded (UK)

Who is the main contact?
Julian Stevens

Trial website

Contact information



Primary contact

Mr Julian Stevens


Contact details

81 Britannia Walk
N1 7RH
United Kingdom
+44 20 7251 4835/4836

Additional identifiers

EudraCT number number

Protocol/serial number

Protocol version 4.3

Study information

Scientific title

Prospective observational study to evaluate femtosecond laser lens fragmentation, anterior capsulotomy cataract and lens extraction surgery


Study hypothesis

To describe the safety of femtosecond laser lens fragmentation and anterior capsulotomy assisted cataract and lens surgery

Ethics approval

NRES Committee London - City Road & Hampstead, 30/01/2012, ref: 12/LO/0042

Study design

Prospective observational study

Primary study design


Secondary study design

Non randomised controlled 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


Cataract, refractive error


This is an observational study of surgery outcomes.

Intervention type



Drug names

Primary outcome measure

To record any complications or adverse events

Secondary outcome measures

To describe the ability of the intraocular femtosecond laser to successfully perform an anterior
capsulotomy and phakofragmentation during cataract/lens surgery.

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

Any subject planned to undergo femtosecond laser assisted lens surgery. These subjects will already meet these criteria:
1. Subjects must be adults (>16 years), undergoing refractive lens or cataract surgery
2. Subjects must provide informed consent, have signed the written informed consent form, and been given a copy
3. Subjects must have a calculated average corneal power after of ≤ 50.00 D in the eye to be implanted
4. Subjects must have a pharmacologically dilated pupil >6.0 mm, in the eye to be implanted
5. The central anterior chamber depth must be >2.0 mm (Pentacam)
6. Subjects must be willing and able to return for scheduled follow up examinations for 3 months after surgery

Participant type


Age group




Target number of participants


Participant exclusion criteria

1. Subjects with subluxated crystalline lens
2. Subjects with endothelial dystrophy, guttata, in the eye to be implanted
3. Subjects with keratoconus (or keratoconus suspect) in the eye to be implanted or K>50 D
4. Subjects with distorted or unclear corneal mires on topography maps of the eye to be implanted
5. Subjects with a history of Herpes zoster or Herpes simplex keratitis.
6. The central anterior chamber depth <2.0 mm (Pentacam)
7. Tremor with head titubation
8. Subjects who are participating in any other ophthalmic drug or device clinical trial during the time of this clinical investigation

Recruitment start date


Recruitment end date



Countries of recruitment

United Kingdom

Trial participating centre

81 Britannia Walk
N1 7RH
United Kingdom

Sponsor information


Moorfields Eye Hospital (UK)

Sponsor details

c/o Sue Lydeard
Research & Development
162 City Road
United Kingdom

Sponsor type

Hospital/treatment centre



Funder type


Funder name

Investigator initiated and funded

Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

Not provided at time of registration

Intention to publish date

Participant level data

Not provided at time of registration

Basic results (scientific)

Publication list

Publication citations

Additional files

Editorial Notes

07/12/2017: No publications found in PubMed, verifying study status with principal investigator.