as others have said, if this happens really frequently it's best to rule out a physical-level concern, but if there is synchronicity involved it may likely not be a physical issue (but still good to rule it out).
i started to direct you to resources about orbs but it turns out many of those resources don't fit with my own understanding about orbs. in my experience there is often a synchronicity when i see those pinpricks of light. sometimes it's not clear at first, but then i realize it's like they want to encourage me to pay attention to something going on. and sometimes it happens when i'm communicating with someone about spiritual things and it seems like they are just saying hi.
my opinion, if it's not a physical issue, is that there is benevolent energy saying hello to you. call it angels or something else. could be your team of guides is communicating through these bits of light. i'm not sure of the significance of the crescent shape. you might ask your guides to give answers to why it looks that way, brainstorm the possible reasons and ask them to confirm with the light shapes when you get to the right answer. remember to 'use protection' if you intend to connect with your guides. good luck, inspiring situation to read about
