Arch Ophthalmol. Aug;(8) Multicenter Trial of Cryotherapy for Retinopathy of Prematurity: ophthalmological outcomes at 10 years. Cryotherapy . The most effective proven treatments for ROP are laser therapy or cryotherapy. Laser therapy “burns away” the periphery of the retina, which has no normal. are discussed. Retinopathy of prematurity (ROP) is a leading cause of childhood blindness.’2 Cryotherapy was first used in the treatment of this condition in the.

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Most other complications of ROP were also more frequent in control eyes, including corneal clouding, cataract, and glaucoma. Today, with advances in neonatal care, smaller and more premature infants are being saved. It is possible that laser may be associated with less peripheral visual field constriction, less pathological myopia, xryo lower risk of macular retinopathy, 1314 but it is unlikely that a large-scale comparative trial would be feasible because of the almost universal adoption of laser photocoagulation.

This keeps the vitreous gel from pulling on the scar tissue and allows the retina to flatten back down onto the wall of the eye.

Results of U.S. randomized clinical trial of cryotherapy for ROP (CRYO-ROP).

When a baby is born full-term, the retinal blood vessel growth is mostly complete The retina usually finishes growing a few weeks to a month after birth. The quality of the data obtained, the study design, and the decision to terminate enrollment early when the benefit of treatment was apparent set standards against which current and future clinical treatment trials will be measured.

The very high completion rate of 5- and year follow-up examinations for the study, the development of the subjects to the point at which more sophisticated visual function tests can be done, and the time elapsed from the initial treatment have allowed the study to achieve this long-term descriptive goal.

The CRYO-ROP study was also very influential among ophthalmologists managing pediatric vision problems in adopting the Teller Acuity Card procedure, which is now used in many pediatric eye clinics to quantify visual function in preverbal children.

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Evaluating the Cryotherapy for Retinopathy of Prematurity Study (CRYO-ROP)

A second examination by a different clinician was used as a measure to control for bias in staging. The study identified the zone 1 eyes to have ctyo worst prognosis both with and without treatment.

Sign in to download free article PDFs Sign in to access your subscriptions Sign in to your personal account. The Teller Acuity Card procedure and similar forced preferential looking grating tests, while not perfect proxies for optotype visual acuity, have contributed to the clinical treatment of amblyopia, cataracts, and other vision problems in children in addition to ROP. We anticipate that the study crryo will continue to be measured and data continue to be reported as the cohort reaches visual maturity and adulthood.


The early results of the trial also showed what had become apparent clinically to the ophthalmologists with experience with cryotherapy: Stage V — Completely detached retina and the end stage of the disease.

Few studies have so influenced the clinical care of ophthalmic disease and been so broadly accepted within the clinical community in such a short period. About 90 percent of all infants with ROP are in the milder category and do not need treatment. Infants who rpo had a sclera buckle need to have the band removed months or years later, since the eye continues to grow; otherwise they will become nearsighted.

Inscientists funded by the National Institutes of Health determined that the relatively high levels of oxygen routinely given to premature infants at that time were an important risk factor, and that reducing the level of oxygen given to premature babies reduced the incidence of ROP. Many children who develop stage II improve with no treatment and dop develop normal vision.

ROP occurs when abnormal blood vessels grow and spread throughout the retina, the tissue that lines the back of the eye. CRYO-ROP changed tremendously the way we treat ROP from the previously highly variable strategies, including everything from nonintervention to treatment of even mild cases, to the current nearly universal application of peripheral retinal ablation at specific levels of severity based on evidence from this and subsequent randomized trials.

Sign in to customize your interests Sign in to your personal account. Study conclusions and recommendations. Create a free personal account to access your subscriptions, sign up for alerts, and more. Ethical concerns also complicated the development of this study design. Grating visual acuity in eyes with retinal residua of retinopathy of prematurity: The action of the data safety monitoring committee to terminate enrollment early due to statistically relevant early analysis, in one of the first instances of its kind in an ophthalmology clinical trial, demonstrated the statistical and ethical value of this approach to clinical trials.

If, as the trial goals intended, a benefit was seen with cryotherapy, randomized patients were eligible to have this benefit only in one eye and were not eligible to be treated in the opposite control eye.

Transscleral laser photocoagulation has also been reported. Get free access to newly published articles Create a personal account or sign in to: Stage IV ccryo Partially detached retina.

The natural history cohort has provided unique, well-documented information about the course of eyes with advanced acute ROP without treatment. At the year outcome measurement, Ultimately, however, the most important measure of the impact of a clinical investigation is cryk influence on the clinical practice of medicine.


Some infants who develop stage III improve with no treatment and eventually develop normal vision. These results were reported in the initial manuscripts published cryl the study.

It is possible that treatment at an earlier stage may also have been effective in some cases, and this is the subject of a subsequent, second-generation study of laser panretinal photocoagulation for ROP, the Dop Treatment for Retinopathy of Prematurity trial ETROP. The paired analysis provides a strong control for environmental covariables in these complex cases with many factors that might influence visual outcomes.

Purchase access Subscribe to the journal. Sign in to make a comment Sign in to your personal account. Patient Selection and Randomization. Cryp the evolution of better methods of peripheral ablation, with cryotherapy having been replaced nearly completely by laser photocoagulation, this study marks the point at which the treatment of ROP became data-driven and when the application of systematic screening and treatment for ROP became the standard of care in the clinical practice of neonatology.

Often, only part of the retina detaches stage IV. Recently, new information from the ETROP study has modified screening recommendations, 29 but the CRYO-ROP data have remained the most influential evidence in the development of guidelines for ophthalmic consultation and screening in neonatal units. Purchase access Subscribe to JN Learning for one year. Treatment of acute retrolental fibroplasias by cryopexy. Several complex factors may be responsible for the development of ROP.

However, some patients presented with asymmetric involvement, requiring a different randomization scheme, randomizing to treatment or no treatment in the single randomized eye. Purchase access Subscribe now.

The most effective proven treatments for ROP are laser therapy or cryotherapy. As a result, new abnormal vessels begin to grow. Despite the cautious initial recommendations of the authors that routine treatment of both eyes with threshold ROP could not be supported by early study data, ablative treatment in fact became the standard of clinical care for all eyes with threshold ROP within the years after the initial results of the study were known and remains so today.

By judicious choice of a threshold for treatment that allowed a statistically and clinically relevant improvement in outcomes, and by choosing outcome measures that were both expeditious fundus appearance and relevant visual functioncryi study planners created a framework for answering the important question of treatment benefits from ablative therapy.