New in iOS 10 Display Accommodations
iOS lets you invert colours, reduce white point, enable greyscale or choose from a range of colour filters to support different forms of colour blindness or other vision challenges. You can select a common preset or fine-tune the colour tint and hue to customise a display setting that works for you. And once you set your filters, the settings apply to everything that appears on your iPhone.
When you activate Larger Dynamic Type, the text inside a range of apps, including Calendar, Contacts, Mail, Messages, Music, Notes, Settings, and even some third‑party apps, is converted to a larger, easier‑to‑read size. And you can choose bold text to make the text heavier across a range of built‑in applications.