Scleral Lenses: SynergEyes VS

The SynergEyes VS lens is an innovative scleral lens with a distinctive bi-tangential periphery designed to accommodate a wide variety of corneal conditions.

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The lens completely vaults the cornea and limbus landing entirely on the sclera. The toric periphery of the lens may be precisely controlled in both the flat and steep meridians, aligning with the scleral for ease of landing and stability.

The lens was designed by acclaimed scleral lens authorities at Visser Contact Lens, in association with NKL Contactlenzen, a Menicon subsidiary, in the Netherlands. The lens has been successfully prescribed to thousands of irregular cornea contact lens patients in 24 Visser Contact Lens Eye Clinics in Europe.

The SynergEyes VS scleral lens is integrated into the RxConnect Fitting Resource. This system combines topographical information with exam data to recommend the initial trial lens from the 16 lens diagnostic set.

scleral lens graphic-v1

Lens Design:

  • The SynergEyes VS scleral lens vaults the entire cornea and limbus and lands on the sclera.
  • This non-rotationally symmetrical lens design incorporates two key innovations to maximize comfort and optimize lens performance:
    • Linear landing zones
    • Landing zones with bi-tangential toricity
  • The linear landing zones are designed to follow the linear (rather than curved) shape of the sclera, accommodating a toric sclera, which is present in 95% of cases. The adjustable angles of the flat or steep meridians aim to distribute the lens pressure more equally over the sclera and improve the scleral lens fit with less risk of air bubble formation or blanching of the conjunctival scleral vessels.
  • The toric landing zones are designed to provide consistent stabilization allowing for a front-surface cylinder, which can greatly improve vision in patients with residual astigmatism.

Research:

Research data suggests that toricity is more pronounced in the scleral area than in the limbal area, irrespective of the toricity of the cornea.²  Van der Worp, et.al found in most cases, the shapes of the limbus and anterior sclera were tangential rather than curved. This information was the basis for designing a scleral lens with a bi-tangential (non-rotationally symmetrical) periphery.

The objective of a scleral lens with tangential fitting is to reduce the adhesive pressure on the eye, to achieve greater tolerance and prolong the daily duration of use.³ The ability to adjust the flat or steep meridian of a bi-tangential design distributes the lens pressure more equally over the sclera and improves the scleral lens fit.¹

History of Scleral Lenses Video:

 
References:

1. Visser, Medical Applications and Outcomes of Bi-tangential Scleral Lenses. Optometry and Vision Science VOL. 90. NO.10, Oct. 2013
2 .Van der Worp E, Graf T, Caroline PJ. Exploring beyond the corneal borders. Contact Lens Spectrum 2010; 25 (6):26–32.
3. Van der Worp E. A Guide to Scleral Lens Fitting (monograph online). Pacific University Common Knowledge: Books and Monographs.
2010. http://commons.pacificu.edu/cgi/viewcontent.cgi?article=1003&context=mono.

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