Joan is a 60 year old female who has presented today with blurred vision. Joan informs you that over the last few weeks she has noticed that she finds it difficult to focus on images as the central areas become ‘foggy’ and in addition, lines appear curved. She denies any pain or redness and is otherwise well in herself. Joan has COPD, Iron deficiency anaemia and Hypertension. Unfortunately, she continues to smoke, though has agreed to a referral to the smoking cessation service. On examination, there is no conjunctival injection, pupils are equal and reactive to light and eye movements are normal. Visual acuity is 6/18 in her left eye and 6/12 in her right eye. You attempt fundoscopy but cannot identify any obvious pathology.
Given the likely diagnosis what is the most appropriate next step?