Concentric ring scanning laser ophthalmoscope artifacts and dysphotopsia in diffractive multifocal pseudophakia

Area of Science:

• Ophthalmology
• Optical Engineering
• Medical Imaging

Background:

• The study investigates visual disturbances and imaging artifacts experienced by patients with diffractive multifocal intraocular lenses (IOLs).
• Specifically, concentric ring dysphotopsias and scanning laser ophthalmoscopy (SLO) findings are examined in the context of ReSTOR IOL implantation.

Observation:

• A patient reported decreased visual acuity and concentric ring dysphotopsias after receiving ReSTOR IOLs.
• Scanning laser ophthalmoscopy revealed concentric ring patterns in the patient's retina, correlating with her visual complaints.

Findings:

• Concentric ring patterns on SLO were observed in other ReSTOR IOL recipients without dysphotopsia, but not in monofocal IOL or phakic eyes.
• Optical analysis indicates that SLO artifacts result from laser reflection off the IOL surface, while dysphotopsias stem from light diffraction by the IOL.

Implications:

• The diffractive optics of multifocal IOLs are identified as the source of both visual phenomena and imaging artifacts.
• Understanding these optical principles is crucial for managing patient expectations and improving IOL design.