Objective Scatter Index: Working Toward a New Quantification of Cataract?

Purpose: To investigate the associations between clinical cataract classifications, quality of life (QOL), and the objective loss of ocular transparency in patients presenting with clinical cataracts.

Methods: In this prospective, multicenter, cross-sectional study, 1,768 eyes of 1,768 patients (mean age: 72.5 years; range: 28 to 93 years) referred for cataract assessment were enrolled. Visual acuity was measured before slit-lamp examination to determine the severity of lens opacification using the Lens Opacities Classification System III. Patients were asked to complete the Visual Function Index (VF-14) questionnaire. Ocular transparency was quantified by Objective Scatter Index (OSI) and was measured by the HD Analyzer (Visiometrics SL, Terrassa, Spain). Association and categorical data analysis were performed between each measured parameter alongside cross-tabulation analyses to determine sensitivity and efficiency of the HD Analyzer.

Results: High OSI levels corresponded slightly with a lower visual acuity value and corresponded better with lower VF-14 scores. OSI scores were strongly associated with cataract classification and severity. Cross-tabulation analysis revealed a high sensitivity and efficiency index for the OSI with these clinically validated parameters illustrating good agreement overall for the OSI in determining cataract.

Conclusions: The OSI measured by the HD Analyzer is a sensitive and efficient tool to be considered in the early detection of cataract in patients.