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Perusal of something such as a letter, article, document, is the action of reading it carefully with intention to remember.
“for your perusal” means for you to look through or over/examine the contents of. You read a piece of written work with a view to checking the detail contained in it. You would carry out such a process before signing a contract, for example. It is also a very formal way of asking if someone has any objections with what you have written.
Attention is the act of listening to, looking at or thinking about something/somebody carefully.
You end a formal letter with “Thank you for your attention”. You thank someone for reading your letter and thinking about it. They may notice it. Maybe your requests or complaints are being dealt with or cared for.
Retention is the act of keeping something or the ability to remember thing.
for your retention = for you to keep.
e.g. This is a video for your retention.
It may mean something differently. You have to look at the whole sentence.