Hey there! I am a high myopic with degree of myopia -8.00D in both eyes. What extra precautions you take than a non-myopic individual when horse riding? (Since I am new to horse riding, I am always in a fear that I might fall down and something bad would happen to my retina/eye) Thanks!
Welcome OP! I am an optometrist myself so let me start by saying you should ask YOUR OPTOMETRIST these questions at your next eye exam so they can better answer them specifically, based on your individual ocular history.
But in general.....
Folks who have high myopia have a slightly increased risk of retinal detachment. This is because the length of the eyeball is longer than it should be, which causes the myopia, and also causes the retina to "stretch" to compensate for this longer eye length. It can make you more prone to having "thin spots" that can rip or tear. It doesn't mean you'll get one, but it does mean you should always go in for a check if you experience any signs or symptoms that could be a retinal detachment. Most commonly people will either notice some sort of black or gray floater that moves around in their vision. Or you could notice a "flashing" or "blinking" light in your vision. Or both. Or you may notice a dark/gray area of your vision that does not move and is always present. There can be many different presentations but it's important to know that you will NOT experience pain with a retinal tear, hole, or detachment. The retina itself does not have pain receptors so therefore it cannot feel pain. But it does transmit a light signal, and that's why it can convey the above signs/symptoms when there is a problem with the retina.
So if we relate that to horseback riding, of course there is risk of falling off your horse as well as being hit by your horse (ex: if they swing their head around and hit you in the head). Any time you have blunt force trauma to the head, whether it is a fall or a hit, it is a very good idea to call your optometrist especially if you sustained the impact NEAR THE EYE. Most optometrists are comfortable dealing with urgent situations like this and are qualified to examine the inside of the eye for any possible rips or tears or detachments that will need a referral for surgical repair. Anyone, high myope or not, should do this. But especially moreso if you are a high myope with an already increased risk of retinal detachment.
If a hole or tear is present, it has the potential to develop into a detachment. The longer the retina is detached, and more permanent the damage becomes. The retina is very sensitive and complex cells - just like brain cells - and they can never be put back together quite the same way, once they are ripped apart.