October 15, 2020

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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Not all babies who are premature develop ROP.

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. 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 differences in 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.

These new blood vessels are fragile and weak and can bleed, leading to retinal scarring.

The blood vessels grow gradually toward the edges of the developing rip, supplying oxygen and nutrients. Data comparing cryotherapy with laser photocoagulation for ROP are limited. Stage I — Mildly abnormal blood vessel growth. But if a baby is born prematurely, before these blood vessels have reached the edges of the retina, normal vessel growth may stop. Skip to main content.

Influence of the study on subsequent clinical investigations. The very high completion rate of 5- and year follow-up examinations for the study, rpo 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. Get free access to newly published articles Create a personal account or sign in to: When, as anticipated by this study design, it became apparent that the benefit of treatment was significantly greater than initially estimated, the data safety monitoring committee exercised its prerogative, and subject recruitment and randomization was stopped.

Create a personal account rkp register for email alerts with links to free full-text articles. However, the magnitude of the benefit of treatment was exaggerated by this design when compared with the vision outcomes.

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. Create a free personal account to download free article PDFs, sign up for alerts, customize your interests, and more. The disease improves and leaves no permanent damage in milder cases of Croy. This cohort will likely never be reproduced because as rol rule severe ROP is universally treated at the present time.


The method of treatment used in the study, peripheral retinal transscleral cryotherapy, was cryi form of retinal ablation most widely used at that time for treatment for ROP, and virtually all of the earlier clinical reports had used cryotherapy. The outcome of top interest, long-term visual function, cannot be measured until years after treatment.

The very high rate of testability and the precision of the test results when compared with optotype recognition provided a major validation of the Teller Acuity Card procedure, 18 which has subsequently become widely used as a practical clinical tool and clinical research tool in pediatric ophthalmology.

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. The quality of the information measured, including its statistical measurement and clinical relevance; the number and quality of publications produced from the data and their subsequent citation; the development of new tools for future clinical research and patient care; and secondary trials founded on the initial results are also important measures of the influence of a clinical investigation.

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.

The screening recommendations were implemented, and most children in neonatal units had access to treatment within a short period of time following the initial publication of the study.

At the year outcome measurement, Our website uses cookies to enhance your experience.

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

Scientists believe that the periphery of the retina then sends out signals to other areas of the rpp for nourishment. Treatment of acute proliferative retinopathy of prematurity during the past 15 years in Tenri Hospital. About 90 percent of all infants with ROP are in the milder category and do not need treatment. After the vitreous has been removed, the scar tissue cgyo the retina can be peeled back or cut away, allowing the retina to relax and lay back down against the eye wall.

This involves placing a silicone band around the eye and tightening it. If treatment for ROP does not work, a retinal detachment may develop.

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. 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.


While ROP treatment decreases the chances for vision loss, it does not always prevent it. Stage II — Moderately abnormal blood vessel growth. Based on the preliminary data, follow- up to age 42 months during Phase II of the study indicated that cryotherapy cruo the incidence of unfavorable structural outcome by It led to the publication of 50 or more manuscripts directly and has influenced many more publications and studies indirectly.

The existing information suggests that laser treatment is equivalent in effectiveness to cryotherapy.

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

Formally, trials must be judged first on the ability to achieve the prospective goals of the investigation, generally a question of benefit and safety of the intervention being tested. An ROP epidemic occurred in the s and early ro; when hospital nurseries began using excessively high levels of oxygen in incubators to save the lives of premature infants.

Despite the cautious initial recommendations of dop authors that routine treatment of both eyes with threshold ROP could not be supported by early study data, ablative treatment in fact roop 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. The primary outcome measure in the CRYO-ROP trial was the masked grading of photographs taken at the 3-month and month follow-up examinations.

Ethical concerns also complicated the development of this study design.

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

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. The lack of reproducible, objective assessments of pretreatment staging is a limitation of the 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.

Stage III — Severely abnormal blood vessel growth. The study determined that light reduction has no effect on the development of a potentially blinding eye disorder in low birth weight infants. 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. Ideally, one would select perfectly matched cases to randomize for an interventional trial.