Thread Tools
Old 12-10-2009, 03:28 PM
Guest
Join Date: Sep 2008
Posts: 5,902
What's the purpose of the Lacrimal punctum?

I was looking in the mirror to find a piece of crud in my eye when I noticed a spot on the inner part of my inner eyelid. When I discovered that my other eyelid had a matching spot, I looked up a diagram of the eye and discovered that this was the inferior lacrimal punctum, which apparently allows tears to drain into the inner nose. Since I've discovered a part of me I didn't know I had, now I'm very interested in it.

What's the purpose of having a duct in our eyelids to drain tears into our nose?
Old 12-10-2009, 03:37 PM
Charter Member
Join Date: Apr 1999
Location: Boston Metro
Posts: 4,285
The eye produces the tear film continuously. Would we otherwise be constantly leaking tears down our faces?
Old 12-10-2009, 07:00 PM
Charter Member
Join Date: Nov 2003
Posts: 4,751
That's exactly it. The lacrimal punctum is the low point drain of the eye. It's like a storm sewer. If, for examply, the lacrimal sac is blocked by something, you'll have constant tearing, and the sac itself will become inflamed and possibly infect, and you'll end up having a dacryocystorhinostomy. I could start a "Ask the person who has had a dacrycystorhinostomy" thread, but it's not that interesting.
Old 12-10-2009, 08:43 PM
Guest
Join Date: Sep 2008
Posts: 5,902
Sorry if I made you recall some bad memories.

I'm guessing the top ducts would work through some kind of capillary action. I'm guessing.
Old 12-10-2009, 08:49 PM
Guest
Join Date: Dec 2002
Location: NYC
Posts: 326
Interestingly enough, some people with dry eye benefit from having small plugs of silicon placed into their puncta. This prevents the tears from draining (or slows down the rate at which they drain,) thereby providing more moisture to the cornea.
Old 12-10-2009, 10:13 PM
Member
Join Date: Dec 1999
Location: Lost In Space
Posts: 7,778
For people with allergies, does this "drain" become clogged? This would explain why their eyes become so teary? (My wife's eyes drip a lot in-step with allergies.) Or, maybe it overwhelms its drainage capacity, I WAG?
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 08:55 AM.

Copyright © 2017
Best Topics: what's a fluffer science themed nursery aerosmith message board white trash fucking despair sandman budget or uhaul guinness blonde ratebeer hornet scars kysa braswell ed anger michael jeter gay ringworm on lip wax eye allegra sleepy wesley crusher sucks midas brakes cost oglaf skeletons kid friendly comedians after forever song amsoil reviews polly holliday married sex friends sister boil popcorn sneeze smells cotton name pronounce sian switchblade mechanism tard strength social committee names penny's boobs living polymaths oldest mountain dv potassium can dogs masturbate congo snake chuck e cheese pizza rumor what to get daughter for first communion does neosporin help sunburn how much do barbers make how to camouflage a security camera united states' or united states's grammar alternator draining battery when car is off bug that looks like a lobster circulate vs auto hvac if they pass on you pass on them how much nyquil is safe what cause sneezing attacks what happens to mail without apartment number tired after quitting smoking cold turkey best dragon auras cookie clicker selling a car in va tip mechanic for oil change songs about the gulf war pour coke on pork why does my cat lick when i scratch her back how to fire harden wood can stamps be reused how to unscare yourself how to drive an suv tie a knot without letting go where do you get chloroform aluminum is a metalloid how to return plates to dmv ny is one foot bigger than the other the library of babel analysis how long is uncooked pasta good for wasp nest in window said the bishop to the actress what is the average gallons per minute for a well