A good way to be reassured that your eyes are not immimently about to fail catastrophically is to do enough research to establish that you don’t have any of the scary-sounding conditions the worry-wart lobe of your brain suggests to you. I’ve crossed off cataracts, a detached retina, and glaucoma from the list of conditions I might have.
An even better way to be thusly reassured is to drop off your glasses for new lenses, pull down an eight-year-old pair to wear while the first pair is being relensed, and notice that your prescription from back then is close to identical to your current prescription.