Optic Nerve Head Shape as a Predictor of the Formation of Acquired Pits of the Optic Nerve (APONs)
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 91
- 试验地点
- 1
- 主要终点
- Optic disc radius ratio
研究概览
简要总结
Acquired pits of the optic nerve (APONs) are an area of focal loss of neural tissue associated with a discrete area of depression/excavation within the optic cup at the level of the lamina cribrosa. It is commonly associated with glaucoma and can be seen on the optic disc when examining the back of a patient's eye. It causes a characteristic visual field defect in the central 5-10 degrees of vision which has a significant impact of a patient's daily activities. There is no treatment to restore vision once it has formed.
Previous studies suggest mechanical stress across this part of the eye may have role in the formation of APONs. The investigators therefore hypothesise that if a patient has a more elliptical shaped optic disc, which would have more irregular mechanical stress across it, it may have a higher risk of an APON forming.
Patients with glaucoma attending the ophthalmology department at University Hospital of Wales have regular photographs taken of the optic nerve/optic disc as part of their routine clinical care in order to monitor the condition. The research team, who are all practicing ophthalmologists in the department, will review anonymised photographs to find optic discs with APONs, and another group with glaucoma but no APONs to use as a control. The research team will then measure the dimensions of the optic disc to determine if APONs are more common in optic discs with a more elliptical shape. The patients' clinical notes will then need to be accessed to collect data on the age, sex and diagnosis. This data will be anonymised using ID numbers once collected.
The final outcomes of the study will the average measured dimensions of the optic disc in each group, and the position that the APON occurs.
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Retrospective
入排标准
- 年龄范围
- 50 Years 至 110 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Documented diagnosis of primary open angle glaucoma (POAG) or normal tension glaucoma (NTG)
- •Under the care of the ophthalmology department at University Hospital of Wales
- •Available optic disc photograph
- •Presence of an APON for disease group, no APON for control group
排除标准
- •No documented diagnosis of POAG/NTG
- •Other form of glaucoma - e.g. traumatic glaucoma/juvenile glaucoma
- •Poor photograph quality
- •Optic disc tilted so that the margin is obscured and cannot be demarcated
- •Coexisting disc pathology, e.g. congenital optic disc pit
结局指标
主要结局
Optic disc radius ratio
时间窗: 6 months
Comparison of the ratio of the maximum/minimum optic disc radius for optic discs with APONs and optic discs with glaucoma but no APON.
次要结局
- The percentile rank of the disc radius at the position of the APON(6 months)