Diabetic Retinopathy Screening in a Patient with Poor Glycaemic Control
A 58-year-old male with type 2 diabetes mellitus for 12 years attends for a routine eye examination. He reports no visual symptoms. His last HbA1c was 9.5% (poor control). He has hypertension and takes metformin and insulin. Visual acuity is 20/20 in both eyes. Intraocular pressure is 18 mmHg in both eyes. Anterior segment examination is normal. Dilated fundus examination reveals microaneurysms, dot-and-blot haemorrhages, and hard exudates in the right eye, with no neovascularisation. The left eye shows similar changes but also cotton wool spots. The patient has not had an eye exam in 3 years. He asks if he needs treatment.
1. What is the diabetic retinopathy severity level and what is the appropriate management?
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The findings indicate moderate non-proliferative diabetic retinopathy (NPDR) in both eyes, with the left eye showing more ischaemia (cotton wool spots). There is no macular oedema or neovascularisation. Management: 1) Educate the patient on the importance of glycaemic control (HbA1c target individualized, but <7% generally) and blood pressure control. 2) Refer to an ophthalmologist for further evaluation and possible optical coherence tomography (OCT) to rule out subclinical macular oedema. 3) Schedule follow-up in 6-12 months, or sooner if vision changes. 4) Emphasize that good control can slow progression. 5) The patient should be advised to return immediately if he experiences sudden vision loss, floaters, or flashes. No treatment is required at this stage, but monitoring is crucial.
2. What role does the optometrist play in the multidisciplinary care of this patient?
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The optometrist is key in screening, monitoring, and patient education. They should communicate findings with the patient's endocrinologist and primary care physician to ensure coordinated care. They can reinforce the importance of HbA1c and blood pressure control, smoking cessation, and lipid management. They should also check for other ocular complications such as cataracts, glaucoma, and dry eye. The optometrist should document the retinopathy level and ensure appropriate referral. They can provide low vision rehabilitation if needed in the future. Regular follow-up is essential, and the optometrist should educate the patient about symptoms of progression. This integrated approach improves outcomes and reduces the risk of vision loss.