Optical and Clinical Outcomes of an Isofocal Intraocular Lens vs. a Monofocal Standard Lens

Area of Science:

• Ophthalmology
• Optical Engineering
• Biomedical Devices

Background:

• Standard monofocal intraocular lenses (IOLs) provide good distance vision but limited intermediate and near vision.
• Advancements in IOL design aim to improve visual outcomes across multiple distances.
• Isofocal lens technology offers a potential solution for enhanced intermediate vision.

Purpose of the Study:

• To evaluate the optical performance and clinical efficacy of the ISOPure isofocal lens compared to the MicroPure monofocal lens.
• To assess visual acuities and contrast sensitivity under various lighting conditions.
• To determine if the isofocal lens provides significant advantages for intermediate vision.

Main Methods:

• Laboratory investigation using a deflectometer to measure wavefront aberrations and effective power of both IOL models.
• Prospective, comparative, and randomized clinical study involving 48 patients implanted with either ISOPure or MicroPure IOLs.
• Measurement of visual acuities and contrast sensitivity under photopic and mesopic conditions at different distances.

Main Results:

• Optical bench testing revealed the isofocal lens exhibited higher effective power due to induced spherical aberration from its aspheric design, providing an addition of +1.00 to +1.50 D.
• Clinical study showed statistically significant improvements in intermediate visual outcomes (at 80 cm and 60 cm) for the ISOPure lens compared to the MicroPure lens (p<0.05).
• No significant decrease in contrast sensitivity was observed with the isofocal lens, and outcomes were unaffected by pupillary size.

Conclusions:

• The isofocal lens design, with its increased central power due to asphericity, effectively enhances intermediate vision.
• The ISOPure isofocal lens offers a clinically significant advantage for intermediate vision compared to standard monofocal IOLs.
• This technology represents a promising advancement for patients seeking improved functional vision at multiple distances.