REFRACTION AND ORTHOPTIC 250722

α 5 ALL RIGHTS RESERVED © Prism 7.1 PRESSON TOP BASE The prism’s lines are horizontal. Real position of the word ‘BASE’ on the Press-On: Right eye: nasal, at the top, text horizontal. Left eye: temporal, at the top, text horizontal. BOTTOM BASE The prism’s lines are horizontal. Real position of the word ‘BASE’ on the Press-On: Right eye: temporal, at the bottom, text horizontal. Left eye: nasal, at the bottom, text horizontal. NASAL BASE The prism’s lines are vertical. Real position of the word ‘BASE’ on the Press-On: Right eye: nasal, at the bottom, text vertical. Left eye: nasal, at the top, text vertical. TEMPORAL BASE The prism’s lines are vertical. Real position of the word ‘BASE’ on the Press-On: Right eye: temporal, at the top, text vertical. Left eye: temporal, at the bottom, text vertical. DIAGONAL BASE The prism’s lines are diagonal. Such a prescription is achieved by locating the axis of the prism diagonally determining the angle with a Rotation Nomograph. Vertical Correction Horizontal Correction Oblique Correction

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