If you have a visual impairment, you can make text on your device appear much larger. Unfortunately, this particular feature has its limitations.
You need good eyes and quick fingers to type on an iPhone as fast as you could on a computer. Though iPhones have been steadily increasing in size, they're still far smaller than full computer keyboards or even tablet PCs. If you find your iPhone's buttons too small, you can enlarge them by using the phone's Zoom feature.
Anytime when we tap on a text field, iPhone will instinctively bring up the default qwerty keyboard on the bottom half of the screen. And it could cause a lot of inconvenience to someone who has eyesight issues, large hands or mobility challenges.