A comprehensive ebook and implementation blueprint that gives AR and VR teams a step by step framework to design and ship spatial experiences that support low vision and hard of hearing users by default. It includes tested contrast theme systems, legible text and HUD patterns in 3D, practical captioning for immersive media, audio cue design for clarity, platform playbooks, measurable QA criteria, and reusable tokens and components. Launch AR and VR experiences with low vision and hearing support built in, contrast safe themes, readable text, effective captions, and intelligible audio cues, so accessibility works out of the box across leading spatial platforms.