This brand name is a playful take on the word "retina".
The word "retiny" contains only six characters and three syllables. Leading companies using three syllable names include KFC, Microsoft and Santander.
Retiny.com is a .com domain. Dot com domains are the most valuable domain extension in the world, famously used by websites like youtube.com. Owning a .com says that you own the word "retiny" online.
This domain was first registered in October 2016. Older domains have an advantage when ranking in search engines.