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Published on: September 8, 2017
Spherical aberration for expanding depth of focus
Joaquín Fernández1, Manuel Rodríguez-Vallejo, Noemí Burguera
1From the Department of Ophthalmology (Qvision), VITHAS Hospital, Almería, Spain (Fernández, Rodríguez-Vallejo, Burguera, Rocha-de-Lossada), the Department of Ophthalmology, Hospital Virgen de las Nieves, Av. de las Fuerzas Armadas, Granada, Spain (Rocha-de-Lossada), the Department of Optics, Pharmacology and Anatomy, University of Alicante, Alicante, Spain (Piñero), and the Department of Ophthalmology (IMQO-Oftalmar), Vithas Medimar International Hospital, Alicante, Spain (Piñero).
Achieving extended depth of focus (DoF) for vision correction involves various surgical techniques. However, a universal solution remains elusive due to factors like pupil diameter changes with age affecting spherical aberration (SA).
Area of Science:
- Ophthalmology
- Optics
- Biomedical Engineering
Background:
- Presbyopia and cataracts significantly impact visual function, driving demand for solutions that restore clear vision at multiple distances.
- Advances in anterior segment surgery offer new possibilities for depth of focus (DoF) enlargement.
- Current technologies include corneal laser refractive surgery and intraocular lens (IOL) implantation.
Purpose of the Study:
- To provide a comprehensive overview of current strategies for extending the depth of focus (DoF).
- To analyze the challenges and limitations in achieving a persistent, age-independent solution for DoF enhancement.
- To discuss the role of spherical aberration (SA) modulation in DoF extension.
Main Methods:
- This narrative review synthesizes current literature on DoF extension techniques.
- Analysis includes procedures utilizing aspheric profiles in cornea and IOLs.
- Consideration of physiological factors influencing treatment efficacy, such as pupil diameter variations.
Main Results:
- Multiple technologies exist to extend DoF, including laser surgery and IOLs.
- Aspheric designs modulate spherical aberration (SA) to broaden focal planes.
- SA induction for DoF extension is not a universally persistent solution due to age-related pupil changes.
Conclusions:
- While various methods enhance DoF, a single, enduring solution is lacking.
- The effectiveness of SA modulation is significantly influenced by pupil size, which changes with age.
- Further research is needed to overcome these challenges for optimal visual outcomes in presbyopia and cataract treatment.
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