Hi, I am a trainee Optometrist and I've only just started. This question keeps coming up in our practice questions and I don't know how to begin. Any pointers would be great. Sorry if it's a stupid question but I'd really appreciate help, our covering lecturer doesn't speak much English.
Two thin toric lenses are placed in contact with each other. What is the resultant sph-cyl prescription resulting from the two lenses in contact given that the first thin toric lens is made to the specification:
+5.50DC ×10 / +8.50DC ×100 −4.00
and the second thin toric lens is made to the specification:
+6.00____________________
−3.50DC ×115 / −5.50DC × 25
Express your answer in negative sph-cyl form
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