i use windows 8 operating system,whenever i navigate to login page of browser in internet explorer 10 or even at logon screen of operating system,i used to see eye symbol over there

whenever i type the password the eye symbol occurs,when i press the eye symbol the password is visible on plain text,what's the security behind this eye,is this vulnerability on windows?

Any security behind this eye?

I use the Windows 8 operating system. Whenever I navigate to the login page of Internet Explorer 10, or even the login screen of the operating system, I see an eye symbol at the end of the password input.

There is always an eye symbol in password inputs. When I press the eye symbol, the password is visible in plain text.

What’s the security of this eye? Is this a vulnerability in Windows?