Size of Spectacle Prescription Pre-op vs Post-op
This set of data details compares the proportion of patients undergoing customised cataract surgery or refractive lens exchange who have a spectacle prescription of ±0.50 dioptres and ±1.00 dioptres.
Clearly very few patients have this measure prior to surgery – the small proportion that do are likely to be patients who happen to be lucky enough to have a minimal spectacle requirement before surgery for cataract. Also a small number of patients request refractive lens exchange to alleviate their need for reading glasses even though they have no significant need for distance glasses to start with.
As can be seen the vast majority of patients are within ±1.0 dioptres and over 85% are within ±0.50 dioptres after surgery. A small proportion of patients may benefit from Laser vision enhancement after cataract or refractive lens exchange – in my independent practice these patients will be offered this service as part of the process.
The range of prescriptions before surgery is very wide ranging from +9.75 to -21.50 clearly after surgery this range is much narrowed and in general most patients can achieve the gold standard target of ±0.50 dioptres.
(Data from 197 surgeries as at 12/2/11)
|Pre operative||Post operative|
|Prescription within ±0.5dioptres of zero||2%||86%|
|Prescription within ±1 dioptres of zero||3%||97.5%|
|Average prescription (dioptres)||3.9||0.02|
|Range of prescriptions||+9.75-21.50||+1.1-1.75|