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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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A lack of standardized terminology and grading, and especially a lack of comparative clinical trial data, led to the reluctance of many fryo to embrace this treatment.

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

Scientists believe that the periphery of the retina then sends out signals to other areas of the retina for nourishment. Create a free personal account to make a comment, download free article PDFs, sign up for alerts and more.

About 14,—16, of these infants are affected by some degree of ROP. The purpose of the proposed study is to examine the long-term structural and functional effects of cryotherapy as a treatment for severe retinopathy of prematurity ROP. Measurement of visual function of children with associated developmental, neurological, and ophthalmic complications of their premature birth is very cryk and complex.

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

Many children who develop stage II improve with no treatment and eventually develop normal vision. 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.

However, this was the first major multicenter clinical trial to use a standardized procedure, including masked examiners and standardized presentation of gratings.

Nevertheless, there remain a substantial group of eyes, Randomizing one of symmetrically involved eyes also allows analysis based on discordant outcome between the two eyes, which would otherwise be assumed to have similar prognosis. Ablative treatment modalities have evolved as well, and currently laser retinal ablation is far more frequently used than cryotherapy, although the findings of the CRYO-ROP study are still the primary evidence used to support ablative treatment.


The existing information suggests that laser treatment is equivalent in effectiveness to cryotherapy. This cohort will likely never be reproduced because as a rule severe ROP is universally treated at the present time. The large treatment effect has persisted throughout the period reported with significant reduction in retinal detachment and macular folds associated with treatment.

During the last 12 weeks of a pregnancy, the eye develops rapidly. In the study, non-physician staff in the NICU were trained to take the photos, which were made available to trained image readers, who evaluated whether the babies needed to be referred for potential treatment.

By all these measures, CRYO-ROP has been highly successful, both in achieving its formal goals as well as developing information to support a new understanding of ROP and the development of visual impairment in young children.

Facts About Retinopathy of Prematurity (ROP) | National Eye Institute

It is difficult to overestimate the impact of this well-designed trial in taking the concept of ablative treatment from controversial to near universal acceptance within a short period of time. Few studies have so influenced the clinical care cyro ophthalmic disease and been so broadly accepted within the clinical community in such a short period. We anticipate that the study subjects will continue to be measured and data continue to be reported as the cohort reaches visual maturity and adulthood.

The choice of an anatomic outcome was appropriately expedient, allowing earlier analysis, and the benefit of treatment has remained clinically rrop statistically relevant in subsequent reports of visual cruo. Long-term measurement of refractive error suggests that both treated and untreated eyes with severe ROP have a high risk for high myopia.

Currently in the U. The present study proposes to follow patients in the randomized group and a relatively small subgroup 67 of potentially high risk patients from the Natural History study through age 10 years, to determine whether the reduction in crjo benefit of cryotherapy seen between ages 12 and 42 months continues into mid-childhood.

The lack of reproducible, objective assessments of pretreatment staging is a limitation of crjo study design and may have introduced bias and variability in the data despite the efforts in the study to train and standardize classification among the investigators and centers. Copyright American Medical Association.


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

Create a personal account to register for email alerts with links to free full-text articles. Some of this caution was removed in the conclusions of the 3-month interval publication.

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 rol randomized trials.

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.

Unfortunately, the treatments also destroy some side vision. Purchase access Subscribe to the journal. The Teller Acuity Card procedure and similar forced preferential looking grating tests, while not cro proxies for optotype visual acuity, have contributed to the clinical treatment of amblyopia, cataracts, and other vision problems in children in addition to ROP.

This information was developed by the National Eye Institute to help patients and their families search for general information about retinopathy of prematurity ROP.

These abnormal blood vessels are fragile and can leak, scarring the retina and pulling it out of position. The use of a separate data safety monitoring committee with authority to cryyo halt the trial if treatment success could be determined with less than complete enrollment was a relatively new innovation at the time of this trial, although it has become routine now.

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