View 2019 Abstracts

Title What happens to the contralateral eye in optic nerve sheath fenestration (ONSF)?
Submitted by Reena Kumari
Abstract Number 122
Review Result rapid fire presentation

The circulation of CSF between the brain and the optic nerve is considered to be a 3-compartment system. ONSF is considered to work by decompression of the subarachnoid space leading to the filtration of the CSF around the optic nerve. It is also considered to cause scarring in the peri optic nerve sheath preventing consequent CSF accumulation and further risk of visual loss.
As the flow of CSF is considered to be a continuous 3 -compartment system the purpose of this study is to look into the consequence of optic nerve sheath fenestration in the contralateral eye.


Patient were identified from the hospital database using the coding system for ONSF
Retrospective case notes review and data analysis were done for these patients.
Redo ONSF and patients with bilateral ONSF were excluded from this study.


• Total 38 patients were identified. 5 patients were excluded due to enough follow up data due to a combination of factors
• Patients were reviewed and the contralateral pre and post visual acuity and pre and post visual field were compared.
• Patients who had poor presenting contralateral visual acuity and visual field showed improvement in the post ONSF visual acuity and visual field.


From our case review we can say that there can be improvement in the visual acuity and visual field in our group of patients. In view of this result we should wait to see for a atleast a short time until the vision and visual fields can be reliably assessed for worsening/progression or improvement before embarking on contralateral side surgery.

Additional Authors
Last name Initials City / Hospital Department
kumari Reena Leicester Royal Infirmary Oculoplastics
Deol Sunny Leicester Royal Infirmary Ophthalmology
Sampath Raghavan Leicester Royal Infirmary Oculoplastics