Factors eliciting adverse effects adverse effects due to contact lens wear can be acute or chronic in nature and can span the range from a mere annoyance to a disabling condition that results in permanent ocular damage or loss of the eye. Wearing contacts too long is called overwear and it can result in some fairly serious issues symptoms of wearing contacts too long it goes without saying the eye needs adequate oxygen to properly function without it contact wearers can suffer a number of brutal side effects from overwear such as eye pain blurred vision. The effects of extended contact lens wear on the cornea have been studied extensively and are well documented when determining the effects of long term contact lens use on the cornea many studies do not differentiate between users of hard and soft contact lenses while studies that have made this differentiation have found similar results. Here are some of the most common side effects of wearing your contacts for extended periods eye pain wearing your contact lenses overnight or taking a nap with them can cause corneal abrasions or scratches on your cornea as you can imagine the condition is painful this happens because the contact lenses deny the corneas hydration and oxygen. Medication side effects medication effects on the anterior segment and contact lens wear some popular systemic medications cause ocular side effects that can disrupt contact lens wear by william l miller od phd faao eyecare practitioners have long known that some medications adversely affect the cornea
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