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Cryotherapy for Retinopathy of Prematurity (CRYO-ROP) - Outcome Study of Cryotherapy for Retinopathy of Prematurity

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: NCT00000133
Recruitment Status : Completed
First Posted : September 24, 1999
Last Update Posted : February 4, 2014
Information provided by:
National Eye Institute (NEI)

Brief Summary:

To determine the safety and efficacy of trans-scleral cryotherapy of the peripheral retina in certain low birth-weight infants with retinopathy of prematurity (ROP) for reducing blindness from ROP.

To determine the long-term outcome for eyes that had severe ("threshold") ROP, both with and without cryotherapy.

Condition or disease Intervention/treatment Phase
Retinopathy of Prematurity Procedure: Trans-scleral Cryotherapy Not Applicable

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Study Type : Interventional  (Clinical Trial)
Allocation: Randomized
Study Start Date : January 1986
Actual Study Completion Date : August 2003

Resource links provided by the National Library of Medicine

Information from the National Library of Medicine

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Ages Eligible for Study:   up to 1 Year   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Premature infants of either gender who were eligible for the natural history study had weighed less than 1,251 grams at birth and had survived the first 28 days of life. They had no major ocular or systemic congenital anomalies. Infants who met these criteria and also had a threshold level of ROP (defined as stage 3+ of the International Classification of Retinopathy of Prematurity occupying five or more contiguous or eight cumulative 30 degree sectors [clock hours] of stage 3 ROP in zone I or II in the presence of plus disease) could be referred for examination to determine eligibility for entry to the cryotherapy trial.

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): NCT00000133

  Show 24 Study Locations
Sponsors and Collaborators
National Eye Institute (NEI)

Additional Information:
Trueb L; Evans J; Hammel A; Bartholomew P; Dobson D; Assessing visual acuity of visually impaired children using the Teller acuity cards., Am Orthoptic J 1992;42:149-154
Evans MS; Wallace PR; Palmer EA; Fundus photography in small infants., J Ophthal Photography 1993;15(1):38-39
Bartholomew PA; Chao J; Evans JL; Hammel AM; Trueb AL; Verness JL; Dobson V; Quinn GE; Acceptance/Use of the Teller acuity card procedure in the clinic., Am Orthoptic J 1996;46:100-106

Layout table for additonal information Identifier: NCT00000133     History of Changes
Other Study ID Numbers: NEI-32
First Posted: September 24, 1999    Key Record Dates
Last Update Posted: February 4, 2014
Last Verified: October 2003

Additional relevant MeSH terms:
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Retinal Diseases
Premature Birth
Retinopathy of Prematurity
Eye Diseases
Obstetric Labor, Premature
Obstetric Labor Complications
Pregnancy Complications
Infant, Premature, Diseases
Infant, Newborn, Diseases