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The "Expected Visual Outcome" (EVO) model: methodology and clinical validation
V Lakshminarayanan1, A J Lang, V Portney
1School of Optometry, University of Missouri-St. Louis, USA.
Problem:
If changes are made to the optics of the eye (e.g., intraocular lens implants, contact lenses, etc.) how will they affect performance on clinical tests of vision?
Method:
A phenomenological method is presented based on in vitro optical transfer function (OTF) and a simple model of human threshold detection.
Results:
The model is used to predict and the results are compared with clinical data (acuity, contrast sensitivity) obtained from pseudophakic patients implanted with a multifocal intraocular lens (IOL). A good qualitative agreement is found with the clinical data.
Significance:
This model predicts the relative change in clinical performance for a given change in the optical components of the human eye. This simple phenomenological model permits numerical prediction of clinical tests and is easily calculable.