Regarding white coat hypertension, the shot isn’t always necessary. Some people’s blood pressure just goes up from the stress of the clinical setting.
I got it when an eye clinic wanted to do my blood pressure (which is kind of weird in itself), which they did shortly after the glaucoma test which never works for me because I have an overdeveloped blink reflex and it turned up high. It really amazes me how people whose job it is to take blood pressure don’t recognize the stress situations that people are in might result in abnormal readings.
Beyond any clinical reason that your eye clinic might want to know your blood pressure (your vascular system is pretty important to your vision) - they may have been incentivized by the CMS to track blood pressure via the MIPS program which ties provider payments to specific documentation and screening measures.
AKA - the government might pay your eye clinic more if they screen you for high blood pressure. (Among other things).