Basic overlay renders - provide an early indication of visual weight, fluency etc. from directly in front of the patient.
Creating a recessed visor as a facade may reduce some of the visual weight in the frame by simply overlapping it. Similar to performance snow goggles where a durable and often thicker frame is required for support and stability, however the visor overlaps a certain amount of the frame visually - reducing the thickness and weight of the goggle.
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