Related Experiment Video
Updated: Jun 13, 2026

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
Published on: May 25, 2020
Final visual acuity results in the early treatment for retinopathy of prematurity study
1, William V Good, Robert J Hardy
1Smith-Kettlewell Eye Research Institute, San Francisco, CA 94115, USA. good@ski.org
Insights
Early treatment for retinopathy of prematurity (ROP) in Type 1 eyes improved visual acuity by age 6. Early treatment for Type 2 ROP did not show a significant visual acuity benefit.
Area of Science:
- Ophthalmology
- Neonatal care
- Pediatric medicine
Background:
- Retinopathy of prematurity (ROP) is a leading cause of childhood blindness.
- High-risk prethreshold ROP requires careful management to optimize visual outcomes.
- Early intervention versus conventional management strategies are debated for specific ROP classifications.
Purpose of the Study:
- To compare visual acuity at 6 years of age in infants with high-risk prethreshold ROP.
- To evaluate the impact of early treatment versus conventional management on visual outcomes.
- To assess the effect of treatment timing on retinal structural integrity.
Main Methods:
- Randomized controlled trial comparing early treatment with conventional management for high-risk prethreshold ROP.
- Symmetrical and asymmetrical ROP cases were analyzed separately.
- Visual acuity (ETDRS) and retinal structure were assessed at 6 years of age by masked testers.
Main Results:
- No overall statistically significant visual acuity benefit for early treatment across all high-risk prethreshold ROP cases.
- Early treatment demonstrated a significant visual acuity benefit for Type 1 ROP eyes (25.1% vs 32.8% unfavorable outcome; P = .02).
- Early treatment resulted in significantly better retinal structural outcomes (8.9% vs 15.2% unfavorable outcome; P < .001) without increasing ocular complications.
Conclusions:
- Early treatment for Type 1 high-risk prethreshold ROP eyes improves visual acuity outcomes at 6 years.
- Early treatment for Type 2 high-risk prethreshold ROP eyes does not offer a significant visual acuity advantage.
- Clinical practice should prioritize early treatment for Type 1 ROP eyes, as Type 2 eyes may regress spontaneously.
Objective:
To compare visual acuity at 6 years of age in eyes that received early treatment for high-risk prethreshold retinopathy of prematurity (ROP) with conventionally managed eyes.
Methods:
Infants with symmetrical, high-risk prethreshold ROP (n = 317) had one eye randomized to earlier treatment at high-risk prethreshold disease and the other eye managed conventionally, treated if ROP progressed to threshold severity. For asymmetric cases (n = 84), the high-risk prethreshold eye was randomized to either early treatment or conventional management. The main outcome measure was ETDRS visual acuity measured at 6 years of age by masked testers. Retinal structure was assessed as a secondary outcome.
Results:
Analysis of all subjects with high-risk prethreshold ROP showed no statistically significant benefit for early treatment (24.3% vs 28.6% [corrected] unfavorable outcome; P = .15). Analysis of 6-year visual acuity results according to the Type 1 and 2 clinical algorithm showed a benefit for Type 1 eyes (25.1% vs 32.8%; P = .02) treated early but not Type 2 eyes (23.6% vs 19.4%; P = .37). Early-treated eyes showed a significantly better structural outcome compared with conventionally managed eyes (8.9% vs 15.2% unfavorable outcome; P < .001), with no greater risk of ocular complications.
Conclusions:
Early treatment for Type 1 high-risk prethreshold eyes improved visual acuity outcomes at 6 years of age. Early treatment for Type 2 high-risk prethreshold eyes did not. Application to Clinical Practice Type 1 eyes, not Type 2 eyes, should be treated early. These results are particularly important considering that 52% of Type 2 high-risk prethreshold eyes underwent regression of ROP without requiring treatment. Trial Registration clinicaltrials.gov Identifier: NCT00027222.
Related Concept Videos
Diabetic Retinopathy
Open Angle Glaucoma: Treatment
Drugs such as carbonic anhydrase inhibitors, α2- and...
Angle Closure Glaucoma: Treatment