What’s the difference between Diffractive and non-diffractive EDOF IOLs?
Standard mono-focal intraocular lenses (IOLs) are the most common type of IOL used in cataract surgery. These lenses are designed to provide patients with either distance or near vision, but not both. This means that patients who have mono-focal IOLs implanted will typically need to use glasses for one type of vision, either for distance or for near.
Diffractive Extended Depth of Focus (EDOF) lenses, such as Synergy IOLs, are a newer type of IOL that provides a smooth continuous focus from near (17 inches) to far (20 feet). These lenses use a diffractive technology that creates multiple focal points, allowing patients to see clearly at a wide range of distances without the need for glasses.
Non-diffractive or smooth-surfaced EDOF IOLs, such as RayOne EMV or Tecnis Eyhance IOLs, provide an increased depth of focus of about 1.5D. These lenses are designed to provide patients with improved near and intermediate vision, and they work really well when used in a blended monovision arrangement. In this arrangement, one eye is focused better at near to mid-range, while the other eye is focused between mid-range and distance.
In conclusion, diffractive EDOF IOLs like Synergy IOLs provide a smooth continuous focus from near to far, non-diffractive EDOF IOLs like RayOne EMV or Tecnis Eyhance IOLs provide increased depth of focus within the 1.5-meter range, and standard mono-focal IOLs provide only distance or near vision. Blended monovision is a great option for people who are looking for a good balance of near and distant vision without glasses.
It is important to note that there is no such thing as a "perfect" or "best lens" for every patient. The choice of an IOL is highly individualized and depends on various factors such as the presence of other ocular conditions, history of previous refractive surgeries, age of the patient, presence, and degree of corneal astigmatism, and more. The relationship between these factors is complex and the decision should be made together with an ophthalmologist who is experienced in both corneal and lens-based refractive procedures.
It is also important to remember that your options in cataract surgery will be limited to the skill set and experience of the surgeon, as well as their access to needed diagnostic and therapeutic technologies. It is crucial to consult with an experienced and qualified ophthalmologist who can evaluate your individual needs and provide guidance on the best IOL option for you.
In summary, there is no one-size-fits-all solution when it comes to choosing an IOL. It is a highly individualized decision that should be made in consultation with an experienced ophthalmologist, taking into account various factors such as the presence of other ocular conditions, previous refractive surgeries, patient age, and corneal astigmatism. The skill set and experience of the surgeon, as well as access to necessary diagnostic and therapeutic technologies, also play a crucial role in determining the best IOL option for you.