Hi M,
Congratulations on The ESA award !!
Further information can be found
Here. As MHB says, it depend on whether any part of your ESA payments are IR ESA.
If they are, then you are automatically entitled to free prescriptions, (There is a tick box options on the back of the prescription) free dental care, and spectacles.
Being in receipt of IR ESA can also passport you to other benefits, such as Housing Benefit (HB) and Council Tax Support. (CTS)
With further regards to IR ESA have a look at this FAQ also :
ESA Premiums bro58