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another phenomenon associated primarily with hard lenses online is "spectacle order blur." when a hard lens is placed on the cornea, the surface topography of the eye is altered, so the patient may have visual disturbances with glasses immediately after removing the lens. spectacle contact blur, in general, is cleared in about 30 minutes, but use of more oxygen-permeable lenses minimizes the problem. advantages of hard lenses lenses include favorable specific gravity (1.18-1.20) and refractive online index (1.49-1.50), excellent visual acuity, durability, ability to withstand weak alkalis or weak acids, and no sensitivity reactions when placed on the cornea. hard lenses are also relatively resistant to the absorption of disinfectants, surfactant order cleaners and environment contact pollutants; they are easy to handle during insertion and removal. disadvantages lenses of hard lenses include a longer adaptation time, poor oxygen permeation and ocular discomfort.

another phenomenon associated primarily with hard lenses online is "spectacle order blur." when a hard lens is placed on the cornea, the surface topography of the eye is altered, so the patient may have visual disturbances with glasses immediately after removing the lens. spectacle contact blur, in general, is cleared in about 30 minutes, but use of more oxygen-permeable lenses minimizes the problem. advantages of hard lenses lenses include favorable specific gravity (1.18-1.20) and refractive online index (1.49-1.50), excellent visual acuity, durability, ability to withstand weak alkalis or weak acids, and no sensitivity reactions when placed on the cornea. hard lenses are also relatively resistant to the absorption of disinfectants, surfactant order cleaners and environment contact pollutants; they are easy to handle during insertion and removal. disadvantages lenses of hard lenses include a longer adaptation time, poor oxygen permeation and ocular discomfort.

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