top of page

Extended Depth of Focus (EDoF) Intraocular Lens (IOL) Technology is a cutting-edge solution for vision correction, designed to provide a continuous range of focus, particularly for intermediate and far distances, with reduced dependence on glasses. EDoF IOLs are commonly used in cataract surgery and presbyopia correction.

How EDoF IOLs Work

Extended Focus Range

Wavefront Technology

  • EDoF IOLs use advanced optics, such as diffractive or refractive designs, to extend the range of clear vision rather than creating multiple distinct focal points (as in multifocal lenses).

  • The lens stretches the focus zone to improve vision at intermediate and far distances while maintaining functional near vision.

  • Many EDoF lenses utilize wavefront engineering to reduce higher-order aberrations and enhance image quality

Contrast Sensitivity Optimization:

  • Unlike multifocal IOLs, EDoF lenses prioritize reducing halos, glare, and loss of contrast, providing better visual comfort, especially in low-light conditions.

Applications in Vision Correction

1. Cataract Surgery

2. Presbyopia Management

  • EDoF IOLs replace the natural cloudy lens, offering a broader range of vision than standard monofocal lenses

  • Ideal for patients who need clear vision at intermediate distances (e.g., computer work) and are willing to wear glasses occasionally for very close tasks.

Advantages of Monofocal IOLs

1. Seamless Vision Transition

  • Provides a smooth range of focus, particularly for intermediate and far distances.

2. Reduced Visual Disturbances

  • Minimizes halos, glare, and other side effects common with multifocal lenses.

3. High Contrast Sensitivity

4. Neuroadaptation

  • Offers sharper and clearer images compared to multifocal IOLs.

  • Requires less neuroadaptation than multifocal lenses, making it easier for patients to adjust.

Challenges and Limitations

1. Limited Near Vision

2. Intermediate Focus Priority

3. Individual Variation:

  • Not as strong for very close tasks compared to multifocal lenses. Reading glasses may still be required for fine print.

  • While excellent for intermediate and far distances, near vision performance may vary depending on lens design.

  • Results depend on individual eye anatomy and visual needs.

Popular EDoF IOL Brands

Alcon Vivity (AcrySof IQ Vivity)

Tecnis Symfony (Johnson & Johnson)

  • Uses a proprietary X-WAVE technology to extend focus while minimizing halos and glare.

  • Utilizes a diffractive design to provide sharp intermediate and distance vision.

IOL Technologies vs. Other Lens Technologies

Rayner RayOne EMV

  • Focuses on enhancing intermediate vision while maintaining excellent contrast sensitivity.

EDOF

Ideal Candidates for EDoF IOLs

1. Active Lifestyles

2. Minimal Glasses Dependence

3. Avoidance of Halos/Glare

  • Patients who frequently engage in intermediate and distance-focused activities, such as driving or using computers.

  • Individuals seeking reduced dependency on glasses for most tasks but are okay with using them for close-up tasks.

  • Patients sensitive to halos or glare, especially those driving at night.

Future Developments

1. Hybrid IOLs

2. Enhanced Materials

3. Customization

  • Combining EDoF and multifocal designs for a more comprehensive vision correction solution.

  • Improved biocompatibility and designs that further enhance contrast sensitivity and minimize aberrations.

  • IOLs tailored to individual eye anatomy for optimized outcomes.

bottom of page