Ocular and systemic causes of retinopathy in patients without diabetes mellitus

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Abstract
Introduction Most general practitioners and physicians are familiar with the risk factors, clinical presentation, and management of retinopathy in patients with diabetes mellitus, commonly termed diabetic retinopathy. Fewer doctors are fully informed about other ocular and systemic causes of retinopathy or the clinical significance of retinopathy in patients without diabetes (referred to as non-diabetic retinopathy in this review). However, retinopathy is fairly common in adults without diabetes,1–4 and doctors routinely encounter such patients in whom clinical or laboratory evidence of hyperglycaemia is consistently absent. Although some patients with retinopathy will have an obvious aetiology (for example, severe anaemia, systemic lupus erythematosis, or underlying carotid disease), many do not have an easily identifiable cause for their retinal signs. What course of action should the doctor take when faced with retinopathy in a patient without diabetes? What are the common ocular and systemic causes of retinopathy? What is the clinical significance of these retinopathy lesions? These and other matters are discussed in this review.