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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The existing information suggests that laser treatment is equivalent in effectiveness to cryotherapy. The differences cryk treatment outcome among the eyes with different stages of ROP, especially zone 1 vs zone 2, have also been an important finding in this study.

Case series, mostly roop Japan in the s and early s, supported the concept of peripheral retinal ablation for ROP during the acute phase, prior to the development of retinal detachment and retrolental fibroplasia.

CRYO-ROP – What does CRYO-ROP stand for? The Free Dictionary

What ctyo primary outcomes did not demonstrate, but what has become clearer as the trial subjects have been followed up to an age when functional vision testing is possible, is that some patients with anatomically favorable outcomes still have poor vision.

Abstract Funding Institution Related projects Comments. Data comparing cryotherapy with laser photocoagulation for ROP are limited. Sign in to save your search Sign in to your personal cyro. In cryoo, scientists funded by the National Institutes of Health determined fop 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.

These data remain the best long-term information available about the consequences of ROP with and without treatment against which other ROP interventions are measured. Our website uses cookies to enhance your experience. Study conclusions and recommendations. Cryotherapy for Retinopathy of Prematurity Cooperative Group. Infants who have 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.


The disease improves and leaves cro permanent damage in milder cases of ROP. These infants are at a much higher risk for ROP. These new blood vessels are fragile and weak and can bleed, leading to retinal scarring.

The large treatment effect has persisted throughout the period reported with significant reduction in retinal detachment and macular folds associated with treatment. The primary outcome measure in the CRYO-ROP cryoo was the masked grading of photographs taken at the 3-month and month follow-up examinations.

Measurement of visual function of children with associated developmental, neurological, and ophthalmic complications of their premature birth is very difficult and complex. Many other secondary outcomes have been reported in the publications of study data.

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

Sign in to download free article PDFs Sign in to access your croy Sign in to your personal account. The study found that this telemedicine approach to identifying severe ROP was about as accurate as regular examinations by an ophthalmologist.

Evaluation of the effects of cryotherapy will be based on examination findings in the posterior pole of the eye and on assessment rip visual acuity, as in Phase II. By all these measures, CRYO-ROP has been highly successful, both in achieving its cgyo goals as well as developing information to support a new understanding of ROP and the development of visual impairment in young children.

However, infants with more severe disease can develop impaired vision or even blindness. Today, with advances in neonatal care, smaller and more premature infants are being saved.

If, as the trial croy 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. Asymmetrical patients assigned to top untreated control group also might suffer if treatment was beneficial. Patients were recruited from admissions to the participating centers, potentially introducing a bias due to their tertiary nature and referral patterns.


Long-term assessment of ocular fundus findings reported over the length of the study have also been very useful in understanding the lifelong anatomical issues related to ROP. In the case of ROP, patients could present with symmetrical involvement of both eyes, allowing randomization of one eye for treatment and eop other for control.

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

Stage V — Completely detached retina and the end stage of the disease. This disorder—which usually develops in both eyes—is one of the most common causes of visual loss in childhood and can lead to lifelong vision impairment and blindness. Sign in to make a comment Sign in to your personal account. About 90 percent of all infants with ROP are in the milder category and do not need treatment.

Follow-up to age 12 months indicated that cryotherapy reduced the incidence of unfavorable structural outcome by The influence of a clinical trial on the broader management of patients is the ultimate measure of the study’s impact.

Stage IV — Partially detached retina. The choice of an anatomic outcome was appropriately expedient, allowing earlier analysis, and the benefit of treatment has remained clinically and statistically relevant in subsequent reports of visual function.

Patient Selection and Randomization. However, some patients presented with asymmetric involvement, requiring a different randomization scheme, randomizing to treatment or no treatment in the single randomized eye.