Noncontact profiling techniques for intraocular lens edge measurements

Area of Science:

• Ophthalmology
• Optical Engineering
• Metrology

Background:

• Accurate measurement of intraocular lens (IOL) edge profiles is critical for quality control and standardization.
• Existing methods may lack the required precision or automation for efficient profiling.

Purpose of the Study:

• To develop and evaluate novel optical techniques for profiling the edges of anterior-chamber style IOLs.
• To create an automated system for implementing focal spot projection for IOL edge analysis.

Main Methods:

• Focal spot projection: Measures reflected light trajectory as a focused beam scans the IOL edge.
• Fringe projection: Utilizes interference patterns from two focused beams on the edge.
• An automated system was developed for focal spot projection, including automated positioning, data acquisition, and profile generation.

Main Results:

• Both focal spot and fringe projection techniques were successfully developed for IOL edge profiling.
• The automated system achieved a resolution of approximately 20 micrometers for typical 300-micrometer wide IOL edges.
• Multiple profiles could be generated automatically, with options for manual IOL positioning for versatility.

Conclusions:

• The developed optical projection techniques offer precise IOL edge profiling capabilities.
• The automated focal spot projection system shows promise as a quality control tool for the IOL industry.
• This technology can aid in establishing appropriate IOL profile standards.