Hi XUE TING! THIS IS FOR YOU!! HAHA!
REFRESH: IF PX RX IS -400DS WHAT SHOULD THE GOGGLES RX BE?
1ST ANS: IF PATIENT WANTS CLEAR VISION ABOVE THE WATER...RX SHOULD STILL BE -4.00DS.
REASON: VERTEX DISTANCE SHOULD NOT DIFFER TOO MUCH UNLESS PATIENT HAS LIKE REALLY PROTRUDING GOGGLES
2ND ANS: IF PATIENT WANTS CLEAR VISION UNDER WATER (I WONDER WHY?? *EVIL SMILE*). THEN THE RX SHOULD BE AN ESTIMATED -2.75DS. YOU WILL THEN HAVE TO EXPLAIN TO PATIENT THAT VISION WILL BE SLIGHTY BLURRED WHEN HE IS ABOVE THE WATER.
-4.00x0.67=ESTIMATE -2.75DS (THINK OF THE RI OF WATER COMPARED TO AIR)
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