I am one of those people with poor eyes and need to wear glass or the screen is nothing but 1 big blurr. A temporary solution until the devs catch on to the idea, is make your play screen larger. I am referring to peeps who play on a lap or desk top system. Hand held.. well that's just an impossibility for me. AND don't just use the game scroll to enlarge, use your browser "+". You can then set it to the best possible size for you to find all the icons including those in events. To move around the screen use your "arrows" or the "w" (up), "s" (down), "a" (left), "d" (right) keys for movement.
I just hope the devs do catch on and all it would take is (like mentioned already) add some color or increase the icon size by 50%. For the Apple event, instead of a bunch of little apples around a tree, 3 larger ones (still smallish but much large than what is currently done) would speed things up a bit for us poorly sighted and color blind people.
Devs keep in mind that all the hammered advertising trying to get players to "buy Diamonds" doesn't do much other than annoy people. Frustrated players tend to not spend at all. Advertise, but Do Not Badger and take logical suggestions with ideas like in this thread, very seriously. It does not take away from, but enhances game play. Happy players tend to spend, because the game is fun, in their view. Give a little to gain a lot.