Aspect noun – A certain way in which something appears or may be regarded. Sight and aspect are semantically related. in vision topic. In some cases you can use "Sight" instead a noun "Aspect". Nearby Word: aspectual
When Katara said that she was dirty, she called it a 'healthy coating of earth' (which also makes sense since she's a Earth-Bending prodigy that relies on the sensory aspect of her powers to compensate for her lack of sight).