Why Silicone Hydrogel Lenses are Better than Conventional Lenses?

The cornea relies on oxygen to preserve its thickness and translucency, and contact lenses decrease the amount of oxygen that the cornea gets that leading to the creation of a hypoxic environment. Studies have indicated a robust correlation between corneal swelling and oxygen transmissibility.9–11 Corneal swelling with contact lenses is exacerbated when the lenses are worn overnight, with the amount of swelling varying from 7% to 15% with the wear of low-Dk hydrogel lenses.11–16

Numerous studies have demonstrated that lenses that are composed of silicone hydrogel materials generate extremely less overnight corneal swelling (varying from 2% to 5%) than conventional low-Dk hydrogel lenses. These values are the same as overnight (closed-eye) corneal swelling without contact lens wear.11,12,17–23 It displays the value of high-Dk silicone hydrogel lenses, which have efficiently eradicated hypoxia for most patients.

Many soft contact lens wearers exhibit a gradual augmentation in myopia known as "myopic creep." Small growths in myopia (< 0.50D) were first observed with daily wear of thick (> 0.1 mm) hydrogel lenses.30-33 Reports persisted with thinner hydrogel lens designs, specifically when they were worn for a longer period.

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This myopic shift may be associated with chronic corneal hypoxia. It is proved that conventional hydrogel lens materials fail miserably to equip the cornea with sufficient oxygen to thwart hypoxic consequences, especially when worn for an entire night. The resultant corneal edema is thought to induce changes in the corneal curvature and refractive index, which augment the eye's total refractive power. But silicone hydrogel lenses tend to generate little or no change in refractive error.

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