You do not need a special “Smart TV” because it works on any television set. You also don’t need an iPhone or iPad to use it, simply an Apple ID.
Apple TV gives you the option to use services such as Netflix. You still need to subscribe to those services, but Apple TV is a one-off purchase that lets you use them on your existing TV.
You can watch streaming TV, listen to Apple music, use social media and other apps, play games and view your own photos and videos from your Apple devices.
Apple TV comes with VoiceOver and is easy and accessible to set up. With a Siri remote you can search for content and make selections using your voice, bypassing any on screen display. It is compatible with lots of braille displays. There are a range of built in colour filters, bold text options and enhanced contrast that you can adjust to suit your eye condition. And they are all easily switched off, so another family member can use the Apple TV in their own preferred way.
The basic model costs about £149. The top of the range Apple TV 4k costs £199. It’s supposed to upscale the picture, make it sharper in HD and gives you greater storage space for your own pictures or video. There are alternatives like Amazon Fire TV which are cheaper, but may not have the same accessibility built in.