Introduction

The msd Mini-Scleral Design design has a distinctive posterior lens surface incorporating reverse geometry with specially designed optical and posterior curves. The msd’s profile curve generates the front surface of the tear layer that forms between the cornea and msd lens. It is this smooth refracting surface that eliminates much of the irregular and regular astigmatism caused by the corneal surface. The msd’s aspheric front surface optics reduces aberrations further improving vision. The msd thinner profile and design results in minimal lens edge/lid interaction, providing excellent patient comfort. The thinner lens profile combined with the high oxygen permeability of Boston XO and Boston XO2 materials allow maximum oxygen transmission, maintaining corneal health.

The msd is easy to fit and is suitable for anterior segment pathology cases ranging from dry eyes, advanced Keratoconus to post Lasik and other compromised and irregular corneas on which fitting corneal contact lenses has not lead to optimal results.

Applications

Applications for the msd lens are numerous and include the majority of pathology cases such as:

• Keratoconus (Oval, Nipple)
• Pellucid Marginal Degeneration
• Keratoglobus
• Post Graft
• RK, PRK and LASIK induced ectasia
• Any compromised and/or irregular cornea
• Dry Eyes

Characteristics

1. The msd lens always centers well.
2. Due to the proprietary, reverse geometry designs, the sagittal depth of the lens can be changed independent of central optic zone profile and/or mid-peripheral/limbal zone clearance values.
3. Sagittal depth value, mid-peripheral/limbal zone clearance, edge clearance, lens material, and lens power are the only parameters to specify when ordering the msd lens.
4. The msd lens is available in two modalities: Fenestrated & Non Fenestrated. Both modalities will be simultaneously addressed throughout this guide.
   • Fenestrated sets: require closer alignment and some vaulting. A fenestration in the lens acts as a controlled release valve for tear exchange and the flow of metabolic debris.
   • Non fenestrated sets: require complete corneal and limbal vaulting. Vaulting dimensions can easily be estimated in micron clearances using a cross section slit-lamp analysis.
5. The proprietary mid-peripheral hinge in the msd lens design creates a unique tear pump, which is present in both fenestrated and non fenestrated lens sets, providing enhanced tear exchange.
6. The thinner profile maximizes DK over L with Boston XO and XO2 materials. Our exclusive edge design results in minimal lens edge/lid interaction, providing excellent comfort.

Ideal Fit