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Evaluation of the 701 interzeag lens opacity meter
L Bonomi1, S Baravelli, C Cobbe
1Istituto di Clinica Oculistica, Università di Verona, Ospedale Civile Maggiore di Borgo Trento, Italy.
Summary
The Interzeag 701 Lens Opacity Meter accurately measures lens opacity, but pupil size affects readings. Opacity Meter results correlate with visual acuity in some cataracts and with age in healthy eyes.
Area of Science:
- Ophthalmology
- Biomedical instrumentation
Background:
- Cataract surgery requires precise measurement of lens opacity.
- The Interzeag 701 Lens Opacity Meter is a device used for quantifying lens opacity.
Purpose of the Study:
- To evaluate the reliability and validity of the Interzeag 701 Lens Opacity Meter.
- To assess the influence of operator and pupil size on the instrument's readings.
- To determine the correlation between Opacity Meter readings, visual acuity, and age.
Main Methods:
- The Interzeag 701 Lens Opacity Meter was used on 122 cataractous and 73 healthy eyes.
- Inter-operator and intra-operator variability (with different pupil sizes) were assessed.
- Correlations with visual acuity and age were analyzed.
Main Results:
- Readings showed minimal difference between two operators.
- Significant differences in readings were observed with varying pupil sizes across all groups.
- The Opacity Meter correlated well with visual acuity in nuclear and mixed cataracts.
- No correlation was found for cortical or posterior subcapsular cataracts.
- A correlation was found between instrument readings and age in healthy eyes.
Conclusions:
- The Interzeag 701 Lens Opacity Meter is reliable between operators but sensitive to pupil size variations.
- The instrument's utility in predicting visual acuity varies by cataract type.
- Age is a factor influencing readings in healthy eyes.