Table 1

Summary of some of the advantages and disadvantages of PCO evaluation systems

System of analysisEase of availabilityObjectivenessFlexibility in use to measure varying criteriaSensitivitySpecificity
+ = very poor; +++++ = excellent.
Vision loss/visual psychophysics+++++++++++
Nd:YAG capsulotomy rates++++++++++++
Slit lamp grading++++++++++++++
Fundus visibility+++++++++++
Schiempflug system++++++++++++
Density map+++++++++++++++++
Computerised analysis of density boundaries++++++++++++++++++++
Texture analysis+++++++++++++++++
Colour coded grid++++++++++++++++++