Human
Eye interaction with Computer
Human-computer Interaction (HCI) is concerned with design, evaluation
and
implementation of interactive computing systems for human use and with
the
study of major phenomena surrounding them. It deals with the interaction
be-
tween users and computers. The basic goal of HCI is to improve this
interaction
by making computers more usable and receptive to the user's needs. That
means
that we want to make the barrier between the human's cognitive model of
what
they want to accomplish and the computer's understanding of the user's
task as
minimal as possible.
The central character for interactive systems is the human. In order to
de-
sign a system which full_ls the requirements of the user we need to understand
capabilities and limitations of the human body , human's thinking as
well as
human's psychology.
Input-Output Channels of Human Eye:
A person interacts with a computer through sending and receiving
information.
The user receives information as input which is output of the computer
and
can response by sending information as input to the computer. That means
the
human's input is the computer's output and vice versa. Human can receive
infor-
mation mainly through the senses. We call these senses human input
channels.
There are _ve di_erent input channels, vision, hearing, touch, taste and
smell.
The _rst three channels are the most important for HCI purposes. Human
out-
put on the other side occurs through motor control of human body parts
like the
limbs, _ngers, eyes, head and the vocal system. Of course the _ngers
play the
most important role for interacting with a computer. We need them for
typing
at the keyboard and controlling the mouse. When you use an application
at a
computer, you interact through an interface with menu bars, icons and
windows.
By interacting with the interface we receive information mainly through
sight.
To understand human sight we will have a closer look at the visual input
channel
now.
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