how could i make model for human eye

Cut the foam ball in half across the middle.

Place the flat sides of the cut ball on a work surface.

Trace a circle in the center of the round side of one of the ball halves using the bottom of a glass or other circular object. This is the iris of the eye.

Draw a smaller circle within the iris, and paint it black to represent the pupil. Paint the iris -- the part between the two circles -- an appropriate eye color, such as brown, dark brown, blue or green.

Use a red pencil to draw curved "veins" stemming away from the iris.

On the other half of the foam ball, draw veins all over the rounded side.

Place the project display board flat on a table. Hot glue the flat side of the ball that has the iris and pupil at the center of the left side of the board. Allow to dry.

On the project board, use a marker to label the parts located in the front portion of the eye. Draw lines leading from their respective locations on the ball to their labels. For each label, add a one-sentence definition. For example, draw a line from the pupil to the board and write: The pupil is a black circular opening in the center of the iris through which light passes to the retina.

Glue the flat side of the other half of the foam ball to the center of the right side of the project display board. Allow to dry.

Draw in and label the parts located in the back of the eye that are not visible from the outside. For example, outline the retina, and add a line from it to the board and its name and definition.

Type up descriptions and functions of the parts of the eye. Print out these write-ups and mount them on construction paper. Glue the mounted descriptions to the center section of the display board. Allow to dry flat.