Optic disc haemorrhages preceding manifest glaucoma.

Area of Science:

• Ophthalmology
• Glaucoma Research
• Public Health Surveys

Background:

• Glaucoma is a leading cause of irreversible blindness worldwide.
• Early detection of glaucoma is crucial for timely intervention and vision preservation.
• Optic disc hemorrhages are a potential sign of early glaucomatous changes.

Purpose of the Study:

• To investigate the prevalence and characteristics of optic disc hemorrhages in a general population.
• To explore the association between optic disc hemorrhages and glaucoma development.
• To determine the latency period between hemorrhage detection and manifest glaucoma.

Main Methods:

• Analysis of data from repeated glaucoma surveys in the Dalby population.
• Observation of 28 hemorrhagic episodes during 3819 examinations of individuals without manifest glaucoma.
• Assessment of factors influencing hemorrhage prevalence, including age and residence.
• Measurement of intraocular pressure (IOP) in eyes with and without hemorrhages.

Main Results:

• Optic disc hemorrhages were observed in individuals without manifest glaucoma.
• Hemorrhage prevalence varied with age and residence.
• The mean IOP in eyes with hemorrhages was 17.0 mmHg.
• Only a small proportion of hemorrhages (4/24) in non-pseudoexfoliation eyes were associated with IOP > 20.5 mmHg.
• Five out of twelve followed cases developed manifest glaucoma within six years.
• The latency period ranged from 2 to 7 years.

Conclusions:

• Optic disc hemorrhages can occur in the early stages of glaucoma, even with normal or near-normal intraocular pressure.
• These hemorrhages may serve as an important early warning sign for glaucoma development.
• Long-term follow-up is essential for individuals with optic disc hemorrhages to monitor for glaucoma progression.