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Over the years, as our standards and outreach grew, Glasgow Neuro gained support and sponsorship from international companies, including major medical charities, airlines, and corporations, to support the Society's events, of which, the flagship is our annual conference. Over the past decade, we have been able to bring a range of speakers to Scotland who are authorities from across the globe, including the chief of neurosurgery at John Hopkins, Henry Brem, and the previous director of pediatric neurosurgery George Jallo. May other esteemed speakers like the chief of neurosurgery at Harvard, Robert Martuza, Professor Sir Graham Teasdale, Professor Charlie Teo, Professor James Goodrich, Professor Henry Marsh, and pioneer of deep brain stimulation Professor Alim Louis Benabid have also honored the occasion. We never shied away from controversial topics and brought Professor Sergio Canavero, who revealed his ongoing head-transplant research at our 2016 conference. After Allan, the past presidents and www.surgicalneurologyint.com

Introduction The paper Cullen chart has been a validated adjunct to perimeters in detecting scotomas for various neuro-ophthalmological pathologies for decades. It was digitized into a prototype-app to empower future users to conduct remote monitoring of visual fields. This project aimed to refine the apps' usability for future users to self-assess and monitor their visual fields by exploring the difficulties faced using the app, to gather feedback, and subsequently to improve its usability for future iterations to objectively compare iterations using the MAUQ scores. Methods Participants (n = 15; age: 24-58) recruited through convenience sampling underwent mixed (quantitative and qualitative) methods to measure 1. Participants' adherence to the app instruction through observation, 2. objective experiences of using the app through self-reporting using the mHealth App Usability Questionnaire (MAUQ), and 3. Subjective experience of app using through semi-structured interviews. Descriptive analysis was computed for observation and MAUQ data. Thematic analysis was adopted to analyse the semi-structured interview data. Results 1/15 adhered to 3 written instructions and 8/15 participants had awkward hand movements. The MAUQ median score was 123/147, the MAUQ domain mean scores - ease of use and satisfaction, system information arrangement and usefulness were 81.6%(45.7/56), 80.6%(33.9/42) and 80.2%(39.3/49), respectively. Questions 4, 5, 9, 11 and 19 were the 5 lowest-scoring questions. Qualitative data were categorised into instructions, test, and feedback which had codes and subcodes. Conclusion Feedback for improvements were surrounding central fixation, remembering peripheral stimuli, uncover eye when interacting with peripheral stimuli, video examples, an introduction to the app and audio instructions.

Aim 30 years ago, Cullen1 (a neuro-ophthalmologist) developed and validated a simple paper chart for evaluation of the central 25 degrees of the visual field. We re-developed this concept in digital form (as a smartphone application) and sought to assess its sensitivity and specificity in detecting field loss, through comparison with formal machine-based perimetry. Method A case series pilot study was performed to test the app-based Cullen chart for concordance with formal machine-based perimetry (Humphrey and Octopus). 18 patients with a range of sellar/parasellar tumours (pituitary adenoma, craniopharyngioma, and meningioma) being managed in a single neurosurgical centre were involved in this study. Patients underwent formal visual field perimetry as part of standard care. They also underwent assessment using the smartphone-based Cullen chart as part of routine outpatient assessment. 37 eye episodes were assessed, incorporating pre- and post- treatment assessment for a range of potentially compressive pathologies. Results The digital Cullen chart had a sensitivity of 75% and specificity of 98% compared with machine-based perimeters. The positive predictive value was 93% and negative predictive value was 92%. Conclusions In the context of visual field assessment for patients with sellar/parasellar tumours, this smartphone-based chart shows strong concordance with machine-based perimeters. It is therefore an accessible visual field screening and monitoring tool for clinicians. With further study, there is also potential for approval as a remote patient-led visual field monitoring method.