We may not yet know what enables reading but, we do know what disables "accessibility" to display screens !

Short answer, black on a bright'ish, white'sh display screen WILL exacerbate eye-strain, presenting in Computer Vision Syndrome, Screen Fatigue or worse, stress related visual "repetitive stress injuries" under the heading of Asthenopia (WHO ICD-10)

For far too many of us "access to text" might as well be rocket science or the quantum mechanics of what the little orange engine light is on the dashboard.

Score My Screen at: https://screenfatgue.me.uk