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Thank you all for your replies this is all make sense and helped a lot!!

Thank you ALL!:cheers:

Hi everyone!

I have a question about the difference between a manual Lensometer.. which has what I believe is called a corona-style target (a cross with a circle of dots in the middle) versus the...

Hi Steph!
Just another way to answer your first question- I think B is the right answer and the reason is because 42.5D (7.9mm) is flatter by 0.4mm than the base curve [this corresponds with the...

Thanks D :)

Hi everyone!

A -3.00 myope will converge around 1PrismD less when looking through his spectacles , right?
(if PD for near is 0.3 cm less distance)

but how do we calculate his accommodation...

Thanks a lot mate! that was very detailed and helpful-- cheers:cheers:

Hi everyone!

I've been struggling with this question in a review exam I have and would appreciate greatly your help... what do you think, here it is:


A patient is to be fitted with an RGP...

Hi everybody,

I need help with 2 matters pleaseeee!

1) I was just wondering if anyone remembers the formula for combining 2 sphero-cylinder lenses which their axises are not 90 to each other,...