Optometry and Vision Sciences - Research Publications

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    Non-arteritic anterior ischemic optic neuropathy
    Cham, K ; Wang, J ; Thanh, N (Optometrists Association Australia, 2019-12-03)
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    Surgical interventions for infantile nystagmus syndrome (Protocol)
    Cham, KM ; Abel, LA ; Busija, L ; Kowal, L ; Bachar Zipori, A ; Downie, LE (Wiley, 2019)
    This is a protocol for a Cochrane Review (Intervention). The objectives are as follows: To assess the efficacy and safety of surgical interventions for infantile nystagmus syndrome (INS).
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    OCT-A and delayed-onset traumatic macular oedema
    Cham, K (Optometry Australia, 2019-06-03)
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    Posterior Cerebral Artery Infarct with Haemorrhagic Transformation
    Cham, K ; Wang, J (SciDoc Publishers, 2017)
    A 65-year-old female presented with visual disturbances a week following surgical breast biopsy and stopping eliquis. A diagnosis of a perioperative posterior cerebral ischemic stroke with haemorrhagic transformation, in the setting of eliquis cessation, was made. Despite several features in this case suggesting a posterior cerebral artery cardio embolic ischemic stroke, differentials such as infarctions of the anterior circulation and middle cerebral artery, other possible causes of posterior circulation stroke, acute peripheral vestibular dysfunction, intracranial or subarachnoid haemorrhage, neoplasms, basilar migraine, toxic or metabolic disturbances, neuro-inflammatory or chronic infectious conditions, and ocular vascular disorders should be considered. Prompt detection and diagnosis of cardio embolic cerebral infarction is crucial to initiate long-term anti-coagulant therapy for secondary prevention. Clinicians should maintain a high index of suspicion for the signs and symptoms of stroke. Apart from a detailed history, a complete neurological examination with appropriate imaging will aid clinicians in detection, diagnosis and prevention of stroke with appropriate referral and management.
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    Using technology to enhance student learning and clinical teaching outcomes
    CHAM, K ; Cochrane, A (Association of Schools and Colleges of Optometry, 2017-03-10)
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    Variable clinical presentations of white without pressure
    CHAM, K ; Shuey, N (Optometrist, 2012-09-20)
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    Optic disc oedema: a diagnosis of exclusion
    CHAM, K ; Shuey, N (Optometry Australia, 2012-09-07)
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    Oscillopsia and the Influence of Stress and Motivation in Fusion Maldevelopment Nystagmus Syndrome
    Cham, KM ; Anderson, AJ ; Abel, LA (ASSOC RESEARCH VISION OPHTHALMOLOGY INC, 2013-03)
    PURPOSE: We examined factors influencing perceptual stability in observers with fusion maldevelopment nystagmus syndrome (FMNS). In addition, we also investigated the effect of visual demand, task-related physiologic stress, and motivation on the nystagmus waveform. METHODS: Perception of oscillopsia during daily activities was assessed via a questionnaire. Perception of oscillopsia in the laboratory was assessed using central and peripheral (10°) light emitting diodes (LEDs) in front of a background display of random, fixed-contrast shapes. Task-induced stress was achieved via a time restricted acuity task with or without concurrent mental arithmetic challenge, and motivation varied using a reward-penalty paradigm. The experiments have been previously described elsewhere. RESULTS: Six out of nine subjects reported experiencing oscillopsia in certain daily activities. in the laboratory, the percentages of trials with perceptions of motion of the led and background were as follows: neither, 60% to 70%; background only, 20% to 30%; both, 5% to 15%, and LED only, 5% to 15%. Over all trials, six of nine experienced oscillopsia for both the low- and high-contrast image respectively (i.e., three subjects never experienced oscillopsia). The background was frequently seen moving for both images regardless of contrast and/or condition. Trials with and without oscillopsia did not differ when comparing foveation. In the second experiment, task-related physiologic stress and motivation were reflected in an increase in heart rate; nystagmus waveform intensity increased and foveation decreased. The magnitude of changes in heart rate was uncorrelated with changes in waveform parameters for all experiments, however. CONCLUSIONS: Preliminary results suggest that the FMNS group does perceive spatially inhomogeneous oscillopsia, similar to infantile nystagmus syndrome (INS), in certain visual environments. In investigating the effect of stress and motivation on FMNS, a new, if tentative, finding suggests that task-induced stress and/or motivation may have a negative impact on the nystagmus. Taken together, our findings provide an insight into the particular environments and tasks that are likely to present particular challenges to persons with FMNS.
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    Posterior Uveal Melanoma
    CHAM, K ; Tram, L (SciDoc Publishers, 2016-12-06)