Better safe than sorry
You should pay a visit to the doctor regularly and have the necessary vaccines to protect you against germs, viruses, and illnesses.
Just for starters, “it is recommended that you visit an ophthalmic practitioner for a sight test every two years” (NHS eye care services).
“Breathe deeply, look away, and count backwards from ten. Relax your muscles and the injection will be less painful. Do not look at the needle. Look at the opposite direction or close your eyes” (India parenting, Child’s Healthcare, Basics of immunization, How to make injections hurt less).
Tell yourself that you need to do it, “to stay healthy, and that really, it won’t hurt much at all” (Girls life, Afraid to get shots).
Always remember: “We suffer more often in imagination that in reality,” Seneca.
As for you dear parents, give them a reward, a small incentive like candy, an ice cream cone, or going bowling, and provide some distraction, so that he or she can be less aware of the happening.