The College of Optometrists

Principles of examining and managing patients with an anomaly of binocular vision

A243
You should assess the patient’s binocular vision as an integral part of a sight test because prescribing decisions for spectacles or contact lenses may affect the patient’s binocular status. For example, there can be a risk of over-minussing a young esophore or under-minussing a young exophore (refer to COVID-19 guidance). 
A244
If you examine a patient who has an anomaly of binocular vision, but they are asymptomatic and the anomaly is not amblyogenic, you may not need to correct the anomaly. In this case, you should inform the patient, or their parent or carer, and advise them on the management option you think is most appropriate. A rare exception to this advice occurs if it is likely that an anomaly will worsen, for example decompensate, if left untreated.94 
A245
You should use visual acuity tests that are appropriate for the age of the patient,95 using crowded tests whenever possible. See section on Examining younger children
A246
You should be aware of the various options for treating patients with binocular vision anomalies, including both refractive techniques and exercises. You should be able to advise the patient about these. 

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