vision

What is a replacement contact lens? A replacement contact lens is a contact lens that you are already wearing successfully and has vision been prescribed to you by a licensed eye vision care professional. we can only provide you with replacement lenses and suggests that you consult with your eye care vision professional on a regular basis. can i purchase one brand if i have a prescription for another? lenses come in different sizes and must be fit to your eye by an optometrist or ophthalmologist. as a replacement center, we cannot sell you lenses that you are not already successfully wearing. you will need to consult your eye doctor and get a new prescription before changing your brand. what if i wear a boston/rgp type of contact lens? we can fulfill any type of boston/rgp contact lens prescription. we guarantee all lenses arrive factory fresh and sealed in the original manufacturers sterile packaging.

soft extended-wear lenses also vision bind down on the closed eye, but they are porous and allow some tears through during sleep. because they have so little form, their binding has little effect on the shape of the eye. vision has approved extended-wear lenses for use up to seven days before removal for cleaning. still, there are risks vision with use of extended-wear lenses, even if it''s just one night. daily-wear lenses are removed daily for cleaning and are a safer choice, provided they aren''t worn during sleep. another sight-threatening concern is the infection acanthamoeba keratitis, caused by improper lens care. this difficult-to-treat parasitic infection''s symptoms are similar to those of corneal ulcers. soft lenses are much vision more comfortable than rigid lenses, thanks to their ability to conform to the eye and absorb and hold water. you can get used to soft lenses within days, compared with several weeks for rigid.

typical cleaning solutions contain surfactants that lower surface tension, emulsify oils and aid in solubilizing other debris. proteins and lipids are soluble in highly alkaline media, but a high ph may cause lens decomposition. consequently, weak alkaline solutions are useful in dislodging deposits from the lens when combined with the surfactants. mild abrasive compounds may also be included in the formulation. one common method for cleaning the lens is the friction method. the lens is placed in the palm of a clean hand along with a few drops of the cleaner. the lens is then rubbed, front and back surfaces, for several seconds. the surfactants depend on the mechanical rubbing of the surface for cleaning vision.

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