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

This study has been completed.
Information provided by:
National Eye Institute (NEI) Identifier:
First received: September 23, 1999
Last updated: February 3, 2014
Last verified: October 2003

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 Intervention
Retinopathy of Prematurity
Procedure: Trans-scleral Cryotherapy

Study Type: Interventional
Study Design: Allocation: Randomized

Resource links provided by NLM:

Further study details as provided by National Eye Institute (NEI):

Study Start Date: January 1986
Study Completion Date: August 2003
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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.
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Please refer to this study by its identifier: NCT00000133

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

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 Identifier: NCT00000133     History of Changes
Other Study ID Numbers: NEI-32
Study First Received: September 23, 1999
Last Updated: February 3, 2014

Additional relevant MeSH terms:
Retinal Diseases
Premature Birth
Retinopathy of Prematurity
Eye Diseases
Obstetric Labor, Premature
Obstetric Labor Complications
Pregnancy Complications
Infant, Premature, Diseases
Infant, Newborn, Diseases processed this record on April 28, 2017