August 2016

 

COVER FEATURE

 

Presbyopia treatment

Tips for effective patient presbyopia discussions


by Rich Daly EyeWorld Contributing Writer

 
   
ASCRS poll

In the 2015 ASCRS Clinical Survey, ASCRS members were asked, “What do you think will be your primary surgical presbyopia correction solution(s) in the next 3 years?” The results show that 52% of respondents plan to use a multifocal IOL as their primary surgical solution for presbyopia patients ages 45–54.

Surgeons have found that discussion of dysfunctional lens syndrome is easy to understand and provides a helpful guide for the growing number of treatment options

What do clinical terms like presbyopia, nuclear sclerosis, and lens accommodation mean to patients? Unfortunately, even carefully explained clinical terms can leave patients confused about the status of their refractive vision and what that means for their treatment options.

Some surgeons are turning to a newer approach that explains patients’ refractive vision as falling into 1 of 3 progressive stages of dysfunctional lens syndrome (DLS). That approach can help patients understand why their vision is changing with age and how various treatment options can provide refractive improvements.

How it works

The first step to determine what stage of DLS a patient’s vision falls into is completion of a comprehensive exam, said Daniel Durrie, MD, professor of ophthalmology, University of Kansas Medical Center, and founder of Durrie Vision, Overland Park, Kansas. “If they are older than 43, then they already know something is changing and we start talking to them about what is going on in the lens,” Dr. Durrie said.

Patients in their 40s are usually in stage 1 of DLS, which they experience as the deterioration of their ability to read close up. They need to push everything farther away, they start buying reading glasses, or myopic patients start taking off their glasses to read.

“When we describe it by how it’s affecting them, the patients understand it and they know that is stage 1 of DLS,” Dr. Durrie said.

Stage 2 of DLS typically occurs in patients in their 50s and 60s and is demonstrated by a deterioration of their night vision and the need for more light to read. At this point, ophthalmologists begin to see some haziness in the junction between the nucleus and the cortex of the lens, and the lens starts turning yellow.

“We may call this nuclear sclerosis on the scientific side but to patients we talk about stage 2 of dysfunctional lens syndrome,” Dr. Durrie said.

Stage 3 occurs with the development of a visually significant cataract.

Understanding options

After explaining the DLS stages to educate patients on ways their refractive vision is going to change over their lifetime, surgeons use it to inform their decision tree. In stage 1, the treatments are LASIK or PRK monovision, or blended vision, which is a lower level monovision; corneal inlays; and refractive lens exchange for patients who are hyperopic above a couple of diopters.

Inlays fall out as an option in stage 2 because of the loss of optical quality, which diagnostics can demonstrate to the ophthalmologist and the patient. Diagnostic tools, like the HD Analyzer (Visiometrics, Terrassa, Spain), can identify major ocular scatter—how much light is lost when the lens goes through stage 2 changes. “There are still some gray areas; we’re still able to do LASIK monovision in the 50s and 60s, but we talk to patients about the fact that eventually they are going to go to stage 3 or late stage 2 and need to have a lens procedure,” Dr. Durrie said. “So a lot of our patients will choose to have lens procedures in their 50s or 60s because it avoids cataract and gets to the root of the problem for presbyopia.” In stage 3 patients still have presbyopia but the degraded lens optics leave lens replacement as the only option.

Dr. Durrie even explains DLS to younger patients who want to know whether LASIK is permanent. Understanding the stages of DLS helps clarify that LASIK does not wear off but that their vision will be affected by their lens changes.

“We want them to know that there are 2 lenses in the eye,” Dr. Durrie said. “When they’re young, we fix the cornea and when they’re older, we fix the lens. It’s worked out well and we’ve been doing this for quite a few years.” The age component is another key to use of DLS to drive treatment decisions, said George Waring IV, MD, associate professor of ophthalmology, director of refractive surgery, Storm Eye Institute, Medical University of South Carolina, and medical director, Magill Vision Center, Charleston, South Carolina.

Patients younger than 50 years old are placed in the corneal refractive track, while those older than 50 who are not complaining of cataract symptoms are put in a refractive lens track. Patients older than 65 years and complaining of symptoms consistent with cataract are put on a cataract track.

“From that point on we are doing different evaluations specific to those tracks,” Dr. Waring said. “If you talk about the first 2 tracks—the cornea- and the lens-based tracks—our practice does an all-digital lens-based exam using digital imaging of the internal crystalline lens, with functional analysis of the lens, such as optical scatter index with double pass wavefront (HD Analyzer). In addition to densitometry, we perform qualitative analysis with Scheimpflug imaging, which allows us to grade the DLS and decide whether the patient will be best served by a corneal-based procedure or a lens-based procedure.”

Criteria for exclusion

Risk factors for the development of ectasia are usually the first complications Dr. Waring looks for when considering corneal options, which also applies to corneal inlays.

Another contraindication for a corneal-based treatment among stage 1 DLS patients is any sort of lens opacity that is not affecting their daily activities. Such patients would be better served by a refractive lens-based procedure.

Monovision is not a reliable option for patients who require prisms to correct double vision, as well as those with clinically significant ocular pathology in the dominant eye that disallows them from having uncorrected visual acuity of 20/20 or better.

Monovision changes

“Most patients are good candidates for monovision,” Dr. Waring said. As U.S. surgeons prepare to incorporate presbyopic inlays into their treatment options, such treatments are expected to be used in place of monovision with growing frequency.

“That’s important because small aperture corneal inlays preserve stereo acuity, which is why patients who were not previously candidates for monovision may do well with this procedure,” Dr. Waring said. “We typically do not perform contact lens trials to simulate monovision because it takes 3 to 6 months for the brain to neuro-adapt to blended vision, so a short-term contact lens trial is not enough time to determine who is a candidate.” Monovision screening includes determinations that patients have the potential for 20/20 or better uncorrected visual acuity in the dominant eye; confidence that good surgical results are likely; and the use of dominance testing.

Inlays versus multifocals

Presbyopia discussions article summaryAnother area where the DLS system is useful is in the explanation of the comparative benefits of inlays and multifocal IOLs, Dr. Durrie said. That is because corneal inlays require extremely good optics—especially the KAMRA inlay (AcuFocus, Irvine, California)—because of the way the technology functions. That insight was provided by the clinical trials.

“If you evaluate the lens and the lens does not have good optics—it is in stage 2 or stage 3 of DLS—then you need to move along to an IOL procedure,” Dr. Durrie said.

Although not available yet in the U.S., an IOL with an inlay (IC-8, AcuFocus) is available overseas.

It is critical for patients to understand that presbyopia is a lens problem, that it has 3 stages, and they need to know what stage they are in. The DLS system helps them understand that, according to Dr. Durrie.

“It’s amazing watching patients’ heads nod as they get it,” Dr. Durrie said. “I’ve been in this field for many years, and this has been one of those breakthroughs in patient education that I think everyone should adopt.”

Editors’ note: Dr. Durrie has financial interests with Abbott Medical Optics (Abbott Park, Illinois), AcuFocus, Alcon (Fort Worth, Texas), and Visiometrics. Dr. Waring has financial interests with Abbott Medical Optics, AcuFocus, and Visiometrics.

Contact information

Durrie: ddurrie@durrievision.com
Waring: georgewaringiv@me.com

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