Impact of a Novel Extended Depth of Focus Intraocular Lens on Visual and Lifestyle Enhancement

Summary

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Description

Presbyopia-correcting intraocular lenses (PC-IOLs) provide cataract and refractive surgeons with an effective treatment option for presbyopia, allowing patients increased spectacle independence post-cataract surgery. Different IOL designs have been developed based on differing optical principals, su...

Presbyopia-correcting intraocular lenses (PC-IOLs) provide cataract and refractive surgeons with an effective treatment option for presbyopia, allowing patients increased spectacle independence post-cataract surgery. Different IOL designs have been developed based on differing optical principals, such as diffractive, refractive and extended depth of focus (EDOF) design. Most commercially available MFIOLs have two optical zones, one that provides distance vision, and the second that provides near vision (i.e. "bifocal IOLs"). Most recently, trifocal IOLs have been released, with the aim of providing a third (intermediate) focal point, and hence an extended range of vision in pseudophakic patients. While being able to provide patients with near, intermediate and distance vision, most MFIOL's carry the risk of increased visual disturbances, such as glare, starbursts, and halos, which for a small percentage of patients may become quite bothersome or even debilitating. Extended depth of focus (EDOF) IOLs aim to provide an extended range of vision from intermediate to distance, with a similar visual disturbance profile to their monofocal counterparts. Prior to recent FDA approval, there was only one other EDOF IOL on the market in the US, which, although provides an extended visual range, still had a significant incidence of starbursts and visual disturbances in some patients. FDA approved in February 2020, the Vivity Extended Vision Lens has demonstrated the ability to provide patients with an extended range of vision, excellent contrast sensitivity and visual disturbance profile comparable to a monofocal IOL, as well as high rates of spectacle independence for most activities. The Vivity Extended Vision IOL (Alcon Laboratories, Fort Worth TX) is an EDOF IOL made of hydrophobic acrylic. This non-diffractive lens was designed to mitigate the effect of presbyopia by providing an extended depth of focus through patented Wavefront Shaping technology. In clinical trials, Vivity has demonstrated significantly better intermediate and near vision as compared to a monofocal IOL, as well as superior spectacle independence scores. Additionally, a validated questionnaire regarding visual disturbances showed the Vivity to have comparable rates of starburst, glare and halos to its monofocal counterpart. In an era where intermediate vision has become very important (e.g. using laptops, tablets, seeing the dashboard in a car), many patients express desire for visual correction at all possible focal points. Vivity appears to deliver this with minimal visual side effects-even less so as compared to other MFIOL's. This is a valuable aspect of Vivity; spectacle independence is an important factor for many patients-however if this is coupled with debilitating glare, haloes or other visual disturbances, dissatisfaction will ultimately result. Multiple studies have explored variables that may influence postoperative success of these MFIOLs, including the impact of dry eye, prior corneal refractive surgery, and proper preoperative consent/expectations. A study has yet to be performed evaluating not only preoperative factors, such as astigmatism, and prior corneal refractive surgery, but also perioperative and intraoperative factors that may also play a role in success of the Vivity IOL implant. In this prospective, nonrandomized "real-world" study, the impact of perioperative factors, such as IOL formulae used, use of femtosecond laser, use of intraoperative aberrometry, as well use of pupillary expansion devices on surgical success will be evaluated. Surgical success will be defined as uncorrected distance, intermediate and near visual acuity (UDVA, UIVA and UNVA, respectively) of 20/40 or better (both monocular and binocular) as well as high levels of patient satisfaction, which will be recorded with a Visual Disturbance Questionnaire, Spectacle Independence Questionnaire, and Visual Quality Questionnaire. Results will provide never-before-published data on important preoperative as well as perioperative factors that may influence success and patient satisfaction with Vivity IOL implantation

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