Like HowStuffWorks on Facebook!

Monsters Inside Me: Parasites from Contacts

The small cells of Acanthamoeba infects the eyes of its host through their contact lens mutating to survive chemical treatments as it feeds on the cornea causing blindness!


Most Watched in Diseases & Conditions

Most Watched in Diseases & Conditions
2:30

Freaky Eaters: Cheesy Potatoes for 30 Years

Most Watched in Diseases & Conditions
7:24

Amazing Families: Autism Profile

Most Watched in Diseases & Conditions
7:56

Mental Health: Unlocking Autism

Most Watched in Diseases & Conditions
1:10

Endoscopy Test

Most Watched in Diseases & Conditions
1:55

Monsters Inside Me: Leishmaniasis

Most Watched in Diseases & Conditions
1:22

Freaky Eaters: Addicted to Cheeseburgers

Most Watched in Diseases & Conditions
3:20

Brainman: Beautiful Pi

Most Watched in Diseases & Conditions
1:34

Understanding: Virus Mutations

Most Watched in Diseases & Conditions
2:22

I Was Dead: A Tale From The Afterlife

Most Watched in Diseases & Conditions
1:38

Cancer Immunity

Most Watched in Diseases & Conditions
4:28

Amazing Families: Asperger's Profile

Most Watched in Diseases & Conditions
2:08

My Strange Addiction: An Adult Baby


Recent Videos in Diseases & Conditions

Recent Videos in Diseases & Conditions
4:09

Physician Ed: Sleep Apnea

Recent Videos in Diseases & Conditions
3:47

Discovery Channel CME: Infertility

Recent Videos in Diseases & Conditions
5:04

Discovery Channel CME: Patient Family Care

Recent Videos in Diseases & Conditions
3:38

Doomsday Bunkers: Bunker Defense

Recent Videos in Diseases & Conditions
1:55

My Crazy Obsession: Pinkifying a Puppy

Recent Videos in Diseases & Conditions
1:40

Inside West Coast Customs: Xbox for Michelle Wie

Recent Videos in Diseases & Conditions
1:37

Inside West Coast Customs: Auto Artist Extraordinaire

Recent Videos in Diseases & Conditions
1:15

Inside West Coast Customs: Inspired Rides Revealed

Recent Videos in Diseases & Conditions
3:01

Bizarre ER: Faulty Firecracker

Recent Videos in Diseases & Conditions
2:26

Breathless Bride: A Dramatic Turn of Events

Recent Videos in Diseases & Conditions
1:03

Breathless Bride: Getting a Cocktail

Recent Videos in Diseases & Conditions
2:09

Hoarding Buried Alive: One of Us is Crazy