Don't get left behind! The modernized is coming. Check it out now.
Say goodbye to!
The new site is coming soon - go to the modernized
Working… Menu

Laser Intervention in Early Age-Related Macular Degeneration Study (LEAD)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01790802
Recruitment Status : Completed
First Posted : February 13, 2013
Last Update Posted : July 6, 2018
Information provided by (Responsible Party):
Center for Eye Research Australia

Brief Summary:
The purpose of this study is to determine whether 2RT nanosecond laser therapy slows the progression to advanced age-related macular degeneration.

Condition or disease Intervention/treatment Phase
Age-related Macular Degeneration Device: 2RT nanosecond laser Not Applicable

Detailed Description:

LEAD is a patient and assessor masked, multi-centre randomized controlled exploratory medical device clinical investigation of 240 participants (1:1 active to shame laser procedure) designed to assess the effectiveness of nanosecond laser treatment of patients with early high-risk AMD.

No less than 240 participants will be randomized into either active laser treatment or sham laser procedure groups at a ratio of 1:1. Patient eligibility based on ocular inclusion criteria will be evaluated using measures of vision, fundus photography, OCT imaging, and macular integrity (MAIA) performed during the qualifying period. Fundus images and MAIA results will be sent to a coordinating centre where these will be reviewed to confirm eligibility based on lesion attributes and the criteria specified in the protocol. Following confirmation of eligibility by the coordinating centre, participants whom satisfy all the inclusion and exclusion criteria can be randomized. Allocation to treatment group will be stratified by smoking status. All participants will receive either active laser treatment or sham laser procedure at the treatment visit and be assessed for retreatment on a semi-annual basis. All participants will be contacted by telephone at 1 week and present for clinical examination visits at 1, 6, 12, 18, 24, 30 and 36 months.

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 292 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double (Participant, Outcomes Assessor)
Primary Purpose: Prevention
Official Title: A Multi-centre, Randomized Trial Into the Safety and Efficacy of Nanosecond Microsurgical Laser Intervention in Early Age-related Macular Degeneration
Study Start Date : November 2011
Actual Primary Completion Date : May 1, 2018
Actual Study Completion Date : May 1, 2018

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: Active laser
Twelve 2RT nanosecond laser shots in two arcs of 6 shots superiorly and 6 shots inferiorly, inside the retinal vascular arcades at an approximate distance from the fovea of 3000 microns, with approximately one laser spot diameter between them.
Device: 2RT nanosecond laser
active laser therapy

Sham Comparator: Sham laser procedure
The maximum illumination button on hte 2RT laser will be briefly pressed by the operating physician at each of the 12 locations where and when the laser would normally be applied. The laser remains in standby mode preventing accidental laser firing.
Device: 2RT nanosecond laser
active laser therapy

Primary Outcome Measures :
  1. progression to advanced Age-related Macular Degeneration (AMD) in the treated eye [ Time Frame: 36 months ]
    rate of progression to advanced AMD, either Choroidal Neovascularization (CNV), Geographic Atrophy (GA) or preclinical atrophy, in the study eye of treatment group compared to the sham procedure group

Secondary Outcome Measures :
  1. progression to advanced AMD in the untreated eye [ Time Frame: 36 months ]
    rate of progression to advanced AMD, CNV, GA or preclinical atrophy in the fellow (untreated) eye

Other Outcome Measures:
  1. reversal of early clinical indicators of AMD [ Time Frame: 36 months ]
    reversal of early clinical indicators of AMD (drusen area)

  2. Improvements in visual acuity [ Time Frame: 36 months ]
    improvement in VA

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   50 Years to 95 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Males or females from 50 to 95 years of age at the time of consent
  • Best corrected visual acuity (BCVA) of 6/12 (20/40) or better in each eye.
  • Bilateral high-risk early AMD: At least one druse ≥125um within an inner macular zone (a circle with a radius of 1500 microns centred on the fovea) with or without pigment.
  • A MAIA static threshold sensitivity less than 25 dB at any point, within a customized grid, as measured using a Macular Integrity Assessment (MAIA) device), at the same location of the one eye on two separate occasions.
  • Pupil dilation of a least 5 mm in each eye
  • Fundus photographs, optical coherence tomography (OCT) and fundus autofluorescence (FAF) images of adequate quality as assessed by the LEAD Image Reading Centre.
  • Ability and willingness to consent, and be randomized, to the 2RT active or sham laser treatment, and all qualification and follow-up phases of the study.

Exclusion Criteria:

  • Any evidence of definite geographic atrophy within the macula (a circle with a radius of 3000 microns centred on the fovea).
  • Any black (hypofluorescent) area of FAF consistent with GA (roughly round or oval shape, sharp margins), and corroborated on colour photography as a patch of hypopigmentation.
  • Any evidence of 'preclinical atrophy' as determined on OCT: loss of the outer retina (RPE and photoreceptors on the cube scan (Spectralis OCT) (49 horizontal B scans, 120 µm apart over a 20 x 20 degree scan). This covers approximately 6 x 6 mm in an emmetropic eye (N.B., peri-papillary atrophy (PPA) further than 1500 microns from the fovea is allowed).
  • Current CNV, or past evidence of CNV in either eye.
  • Any other experimental treatment for AMD, excluding dietary supplements, received in the past 12 months or thought likely to chronically change the course of the participant's retinal disease.
  • Any OCT showing evidence of intraretinal fluid, or subretinal fluid for which CNV cannot be excluded as a cause.
  • A subfoveal pigment epithelial detachment/drusenoid detachment greater than 1000 microns in diameter.
  • Other macular disease with subretinal deposits not typical of AMD, e.g., Malattia Leventinese, Sorsby fundus dystrophy, Alports syndrome
  • Ocular disease in either eye, other than AMD, which significantly compromises the ability to treat or visualize the fundus or would compromise the ability to assess any effect following laser application including;
  • Known allergic hypersensitivity to fluorescein.
  • Previous retinal or other ocular surgical procedures, the effects of which may now or in the future complicate assessment of the progression of AMD.
  • Requirement for any systemic or ocular medication known to be toxic to the retina, such as: Deferoxamine, Chloroquine/Hydroxychloroquine (Plaquenil), Chlorpromazine, Phenothiazines, Ethambutol
  • Any serious systemic disease that will preclude a 3 year survival and regular attendance for follow up.
  • Sensitivity to contact lens application.
  • Any condition that would make adherence to the examination schedule for 3 years difficult or unlikely.
  • Any history of prior laser surgery to the retina.
  • Intraocular pressures of 26mm Hg or higher or if there is some reason to believe the participant may have glaucoma
  • Significant cataract: Nuclear cataract grade 2 or 3, cortical cataract Grade 2 or 3 or posterior subcapsular cataract Grade 2 or 3, by Simplified Cataract Grading System (WHO Cataract Grading Group).

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01790802

Layout table for location information
Australia, Victoria
Centre for Eye Research Australia - Royal Victorian Eye & Ear Hospital
East Melbourne, Victoria, Australia, 3002
Sponsors and Collaborators
Center for Eye Research Australia
Layout table for investigator information
Study Chair: Robyn H Guymer, PhD, FRANZCO Deputy Director CERA
Publications automatically indexed to this study by Identifier (NCT Number):
Layout table for additonal information
Responsible Party: Center for Eye Research Australia Identifier: NCT01790802    
Other Study ID Numbers: CERA201201
ACTRN12612000704897 ( Registry Identifier: ANZCTR )
CTN Number130/2012 ( Other Identifier: TGA )
First Posted: February 13, 2013    Key Record Dates
Last Update Posted: July 6, 2018
Last Verified: July 2018
Keywords provided by Center for Eye Research Australia:
laser treatment, high risk, early AMD
Additional relevant MeSH terms:
Layout table for MeSH terms
Macular Degeneration
Retinal Degeneration
Retinal Diseases
Eye Diseases