Hess Charts (U.K.)

 
Purpose

To assess the amount of restriction of a muscle in case of paralytic or restrictive squint

For follow-up of patients with paralytic or restrictive squint

 
Advantages

Easy to perform

Objective analysis

Follow - up assessment easy

 
Procedure
The patient is seated in front of the cart.

The subject is made to wear red green goggles. A green light projection pointer is given.

Examiner holds a red light projection pointer, used as point of fixation.

Red light is projected on the screen and the person is asked to superimpose the green light over the red.

In normal circumstances both the lights will superimpose.

The goggles are then reversed so that red is in front of the left eye and the procedure is repeated.

The responses are analysed by connecting the response marks with lines.