If your asking about contacts that look like Sharingan, try Googling it!:D
The user might not be able to turn it off and on again
In naruto there are different types of sharingan.The basic sharingan has three types. After them, there is mangekyou sharingan and then Eternal mangekyou sharingan.While the appearance of basic sharingan is same to all users but evey mangekyou sharingan has its unique pattern.naruto doesn't have sharingan and will never have one because he is not a member of the Uchiha clan. The Uchiha clan are the only people that are born with their sharingan.
Its Mangekyo sharingan! The final stage of the Sharingan is the Eternal Mangekyou Sharingan, the difference between the normal Mangekyou and the Eternal Mangekyou is: that each time you use the normal Mangekyou your eyesight gets worse and worse and you eventually become blind. With the Eternal Mangekyou your eyesight will never fade. yes i know this but I've herd the final stage of the sharingan is obtained by sasuke and it is blue
*I'll only answer about Sasuke's Mangekyou Sharingan Sasuke can perform an early stage of Susano'o, he can do the Ameterasu (the Eternal Black Flames), and Tsukiyomi (powerful Uchiha Genjutsu). Sasuke will get the Eternal Mangekyou in the manga, but how it will look like and what Sasuke will be able to do is unknown
The Eternal Mangekyou sharingan is the combination of two Mangekyou sharingans. It gives the user a great power, and the user is able to use the double the amount. The user can use all the power of the Mangekyou sharingan, without worring about blindness. This doujutsu is able to tame the Kyubi but there's only one person that possesses this eye, Madara Uchiha. When he took his brother's eyes, he found a new light that will never fade from his eyes, giving to him the eternal life. In Naruto Shippuden chapter 488, Sasuke Uchiha had an operation that gave him the eternal Mangekyou Sharingan, making him the second one to posess this eye.
Mangekyou Sharingan is different in every person of Sharingan holder.
Madara Uchiha's Eyes are the Eternal Mangekyou sharingan, the highest possible rank of the sharingan that will never go blind and that gives him longevity.
mangekyou sharingan
I believe its during the get together of the new "Team Taka" (Team Hawk)
Kinda obvious, he can't die. He has the EMS (EMS=Eternal Mangekyou Sharingan). That means he lives forever because as it says in the name, he is eternal.
No, Obito and Madara have no relationship or connection with each other. Izuna is Madara's brother whom he takes his Mangekyou Sharingan from to gain his Eternal Mangekyoi Sharingan.
Yes all sharingan are red