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| Author | Subject: fields |
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 zinnia
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fields
Feb 18, 2005 16:22:01 I had my mocks last week and was asked: 1 - "why is it that the temporal field is 100 degrees? How can we see what is effectively behind us?". I actually couldn't think why - any suggestions? 2 - Was asked in IT about calibration of my tonometer - it's automatic canon tx10 so how can I tell whether its accurate? any ideas?! also, does anyone have any pointers on dispensing revision?
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susie
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RE: fields
Feb 21, 2005 13:43:45 Hi - i have an idea about the extra 10 degerees - effectively behind us - i think it is to do with total interan reflection of the light from the cornea.
Probrably have to call the company if your tonometer isn't calibrated - just like i would have o do with the pulsair if it reads anything other than 30 and 50 on demo. Just a thought |
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KevinL
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RE: fields
Feb 21, 2005 23:40:25 Draw a ray diagram (as 1st year optics), as light is refracted by cornea the ray can come from quite a way back (cornea is also steep curve). Limiting factor is the skull shape & how deeply set the globes are. |