What test is required during a follow-up appointment for contact lens wearers?

During a follow-up appointment for contact lens wearers, the Visual Acuity (VA) test is essential to assess the clarity of vision while the patient is wearing their contact lenses. This test is conducted to ensure that the patient achieves optimal visual performance with their lenses. The VA test helps to determine if the current lenses prescribed are the appropriate power and fit, allowing for any necessary adjustments to be made to enhance the patient's vision.

In contrast, while a refraction test is crucial during the initial fitting or if there are complaints about vision clarity, it is not typically required at every follow-up appointment unless indicated. The field of vision test and interior eye examination serve different purposes. The field of vision test evaluates peripheral vision, which is less relevant for assessing contact lens wearers' immediate needs, and the interior eye examination focuses on the health of the eye rather than the visual performance predicted with contact lens wear. Thus, the VA test is the most relevant choice in this scenario.