Objective cataract grading methods and expected contrast sensitivity reestablishment with multifocal intraocular...

Area of Science:

• Ophthalmology
• Optometry
• Biomedical Engineering

Background:

• Multifocal intraocular lens (MIOL) implantation is a common procedure for presbyopia and cataract.
• Assessing pre-operative contrast sensitivity (CS) is crucial for managing patient expectations.
• Objective grading systems for crystalline lens sclerosis can aid in predicting visual outcomes.

Purpose of the Study:

• Determine cut-off points for age and objective metrics predicting contrast sensitivity (CS) changes after MIOL implantation.
• Identify thresholds for age, Ocular Scatter Index (OSI), Dysfunctional Lens Index (DLI), and Pentacam Nucleus Staging (PNS) related to expected CS recovery.
• Guide surgeons in communicating potential visual outcomes to patients.

Main Methods:

• Retrospective analysis of 107 subjects undergoing screening for presbyopia and cataract surgery.
• Measurement of monocular distance-corrected contrast sensitivity defocus curve (CSDC) and visual acuity.
• Grading of crystalline lens sclerosis using OSI, DLI, and PNS objective metrics.

Main Results:

• CSDC correlated better with objective grading methods than CDVA.
• Significant correlations were found between all objective metrics (p < 0.05).
• Identified cut-offs: age ≤ 62, OSI ≤ 1.25, DLI ≥ 7.67, PNS ≤ 1.
• OSI (AUC 0.85) and age (AUC 0.84) showed the highest predictive power for CS outcomes.

Conclusions:

• Surgeons should discuss potential distance CS loss after MIOL implantation based on established cut-off points.
• Combining age with objective cataract grading systems (OSI, DLI, PNS) is recommended for accurate prediction.
• These findings aid in managing patient expectations and optimizing surgical planning for MIOLs.