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Do not base your order on the picture presented.
Hess Lasers include one red and one green lasers and project a single dot of each color. Hess Lasers can be used with Lancaster Screen and score sheet or with our parabolic Hess screens. Hess Laser kit includes red and green Lasers plus specially adapted adult red/green glasses to insure good cancellation. Includes pack of 50 Score Sheets and instructions.
The Hess Test may be more useful in understanding full visual field and any Aniseikonic affects. Further, the Hess Test may be more simple for children to understand thus yielding more reliable results in pediatric situations.