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| Author | Subject: prisms |
|---|---|
 rshah
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prisms
Sep 08, 2007 08:59:14 I am a bit confused about prisms… When calculating differential prism, using p=cf, say for example in the right eye the prism is 4 prism dioptres base up and in the left eye it is 2 prism dioptres up…am I right in saying the differential prism is 2 prism dioptres base up in the right eye? What happens if it is 4 prism dioptres base up in the right eye and 2 prism dioptres base down in the left eye…will the differential prism be 6 prism dioptres base up or will it still be 2 prism dioptres base up? |