How Quickly Does Type 1 ROP Need Urgent Treatment?

If your baby has been diagnosed with Type 1 Retinopathy of Prematurity (ROP), they require prompt specialist treatment, generally within 48 to 72 hours of diagnosis ^[1]. This 48 to 72 hour timeframe is not a “safe waiting period”—treatment should be arranged as soon as feasible.

Immediate Action: Type 1 ROP needs urgent treatment by an experienced pediatric ophthalmology team. If you have not been given a specific treatment date or transfer plan, contact the neonatal or ophthalmology team immediately.

While waiting can be incredibly stressful, please know that Type 1 ROP does not mean your baby’s retina has already detached or that blindness is inevitable. It is a highly treatable diagnosis, and understanding what it means can help you advocate effectively for your baby.

What is Type 1 ROP and Why is it Urgent?

Type 1 ROP is a specific, high-risk classification of the condition ^[1]. Your ophthalmologist determines this diagnosis based on three factors:

• Zone: Where in the eye the abnormal blood vessels are located.
• Stage: How advanced the abnormal blood vessel growth is.
• Plus Disease: Whether the blood vessels are abnormally swollen and twisted.

Specifically, Type 1 ROP means your baby has disease in the center of the retina (Zone I) with “plus disease,” Zone I (Stage 3) without plus disease, or slightly further out (Zone II, Stage 2 or 3) with plus disease ^[1].

This condition requires urgent action because these abnormal blood vessels can quickly create scar tissue that leads to a retinal detachment ^[2]. A retinal detachment occurs when the delicate light-sensitive tissue at the back of the eye (the retina) is pulled away from its normal position. If this happens, it can cause severe, permanent vision loss or lifelong visual disability ^[2][3].

Treating the eye promptly—while the retina is still fully attached—substantially lowers the risk of progression to a retinal detachment and greatly improves the chance of useful vision ^[2][1]. While treatment does not guarantee perfect vision (since prematurity and ROP itself can still affect visual development), it is the most important step to protect your baby’s sight.

Treatment Options

The specific treatment chosen is a highly individualized decision. It depends on your baby’s ROP zone and stage, the presence of plus disease, your baby’s overall health, and the local specialist’s expertise. The two main treatments are:

• Anti-VEGF Injections: A medication is injected directly into the eye to block the chemical signals causing abnormal vessel growth. This is often used when the disease is in the central areas of the retina (Zone I or posterior Zone II) ^[4]. However, anti-VEGF medications require prolonged, careful monitoring because they can delay normal blood vessel development, and doctors are still evaluating their long-term effects on the rest of the body.
• Laser Therapy: The doctor uses a laser to treat the peripheral “avascular” retina (the outer areas where normal blood vessels haven’t grown yet). This destroys areas of immature tissue to reduce the chemical signals stimulating the abnormal vessels ^[4]. It is frequently used for disease located further out (anterior Zone II or Zone III) ^[4]. Laser therapy permanently affects peripheral vision in the treated areas but generally requires a shorter follow-up period than injections.

What to Expect on Treatment Day

Because treatment practices vary by hospital and depend heavily on your baby’s current health, ask your care team what the day will look like. Procedures may be done right in the NICU or in an operating room. Your medical team will provide medications to keep your baby comfortable—ranging from numbing drops to sedation or general anesthesia—and will monitor their heart rate, breathing, and oxygen levels continuously throughout the procedure.

After Treatment: The Importance of Long-term Follow-up

Timely early treatment drastically reduces the risk of unfavorable visual outcomes ^[1]. However, treating Type 1 ROP is not a one-time fix.

If your baby receives anti-VEGF medication, the abnormal vessel growth can sometimes reactivate (come back). While the risk of reactivation is often highest in the early months (such as the first 12 weeks), there is no universal “safe cutoff” date, and late reactivation can still happen ^[5].

Your baby will need careful, long-term monitoring by an eye specialist until the blood vessels in their retina have completely finished growing into healthy tissue ^[5]. Keeping up with all follow-up appointments is absolutely essential to ensure any reactivation is caught early and to minimize the risk of late complications ^[3].