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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These infants are at a much higher risk for ROP. By judicious choice of a eop 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 functionthe study planners created a framework for answering the important question of treatment benefits from ablative therapy.

However, at about the same time as the trial, transpupillary laser photocoagulation was introduced as a alternative treatment. 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 cfyo impairment and blindness. This causes a retinal detachment. However, infants with more severe disease can develop impaired vision or even blindness.

Natural History Control Outcomes. Many other secondary outcomes have been reported in the publications of study data. Get free access to newly published articles Create a personal account or sign in to: Our website uses cookies to enhance your experience.

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

Clinical investigations in ROP confront major barriers to study related to the age and relative immaturity of the subjects, the acute nature and rapid course of the disease, and the associated medical and developmental consequences of prematurity.

Grating visual acuity in eyes with retinal residua of retinopathy of prematurity: Evaluation of the effects of cryotherapy will be based on examination findings in the posterior pole of the eye and on assessment of visual acuity, as in Phase II. Follow-up results confirm that applying a freezing treatment to the eyes of premature babies with ROP helps save their sight.

Follow-up to age 12 months indicated that cryotherapy reduced the incidence of unfavorable structural outcome by Several complex factors may be responsible for the development of ROP.

Although the exact rate of reduction in unfavorable outcomes has varied depending on the length of follow-up and type of outcome measured, the CRYO-ROP study has been very successful in demonstrating the clinically relevant benefit of treatment in both anatomical and functional outcomes.


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. 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.

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. Register for email alerts with links to free full-text articles Access PDFs of free articles Manage your interests Save searches and receive search alerts. Both laser treatment and cryotherapy destroy the peripheral areas of the retina, slowing or reversing the abnormal growth of blood vessels.

The epidemiological description of patients reaching threshold ROP in the study prior to randomization was an important collection of data and has been used to develop screening recommendations. About 14,—16, of these infants are affected by some degree of ROP. The eye starts to develop at about 16 weeks of pregnancy, when the blood vessels of the retina begin to form at the optic nerve in the back of the eye.

About 1,—1, infants annually develop ROP that is severe enough to require medical treatment.

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

Data comparing cryotherapy with laser photocoagulation for ROP are limited. Get free access to newly published articles. Create a free personal account to make a comment, download free article PDFs, sign up for alerts and more. The existing information suggests that laser treatment is equivalent in crryo to cryotherapy. In the initial phase of the study, eyes with 5 contiguous or 8 total clock hours of stage 3 plus ROP, in infants with birth weights less than g.

ROP occurs when abnormal blood vessels grow and spread throughout the retina, the tissue that lines the back of the eye.

About 90 percent of all infants with ROP are in the milder category and do not need treatment. Purchase access Subscribe to the journal.

However, long-term follow-up has identified a low but persistent incidence of late retinal detachment in both treated and untreated eyes. Some infants who develop stage III improve with no treatment and eventually develop normal vision. Stage I — Mildly abnormal blood vessel growth. The smaller a baby is at birth, the more likely that baby is to develop ROP.

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 crto were known and remains so today.


Patients were recruited from admissions to the participating centers, potentially introducing a bias due to their tertiary nature and referral patterns. After the vitreous has been removed, the scar tissue on the retina can be peeled back or rol away, allowing the retina to relax and lay back down against the eye wall. Purchase access Subscribe to JN Learning for one year. The most important early visual function outcome reported was visual measurement using forced preferential looking tests of grating resolution Teller Acuity Card procedure.

The most effective proven treatments for ROP are laser therapy or cryotherapy. Vitrectomy involves removing the vitreous and replacing it with a saline solution. 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.

These new blood vessels are fragile and weak and can bleed, leading to retinal scarring. Sign in to customize your interests 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.

It is possible that laser may be associated with less peripheral visual field constriction, less pathological myopia, and 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. Skip to main content. 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 Early Treatment for Retinopathy of Prematurity trial ETROP.

Long-term results of cryotherapy for active stages of retinopathy of prematurity. This information was developed by the National Eye Institute to help patients and their families search for general information about retinopathy of prematurity ROP. Patient Selection and Randomization.