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Bandage Lense, SCL- My Final Conclusion
Contact lens can prevent further abrasions by providing a protective barrier under which the epithelium can heal itself without being exposed. The criteria are typically pain, and/or persistent corneal surface damage that is of a sight threatening nature. In this case, the contact lens actually improves eye comfort and facilitates healing of the corneal surface. In this case, over time, a protected cornea means a less damaged cornea. A less damaged cornea means less drops, and less drops means less chemicals to irritate your eye.
Contact lenses absorb the tear film, and rub against the conjunctiva in the eyelids, which may cause or exacerbate dry eye. Long-term contact lens wear may decrease epithelial nerve sensation, which would reduce the stimulus to produce more tears.
The presence of ANY contact lens partially (or totally) numbs the surface of the cornea. Here's what happens. The delicate sensory nerves residing within the superficial cornea, (the tiny nerve fibers that sense smoke or overly chlorinated pool water), also sense very tiny changes in tear film chemistry (pH, osmolarity, etc.). These nerves automatically send the appropriate signal to the lacrimal glands: make less tears, make more tears. Loss of corneal sensation interrupts that critical tear feedback loop. Numb corneas don't send signals!
According to researches, there are no evidence that bandage lens help retain moister, on the contrary all researches determined it further dry the eyes and low content water lenses mean only that they suck less water, or in other words less harmful for your eyes. In fact, one of the disadvantage of contact lenses is that people are less likely to feel that their eyes are dry in part due to the fact the contact lenses wear may decrease epithelial nerve sensation. This of course would also reduce the stimulus to produce more tears. This also explain, why contact lenses wearer complained on DES when only when the discomfort becomes unbearable, and not sensitive to DES in the initial phase when it developing
has a lower prelens tear film elimination rate
http://findarticles.com/p/articles/mi_qa3921/is_200303/ai_n9178577/pg_4?tag=artBody;col1
Finally, MGD is even more prone to rapid evaporation than a regular DES patient, and the combination of both MGD and DES similar to what I have make it even more difficult. In summary, objectively, this might work for patients with corneal surface damage or with dry eyes related to contact lens wearing which isn't defined as 'true dry eyes', or that people are less likely to feel symptoms due to the reduced nerve sensation.
http://http://findarticles.com/p/art...g=artBody;col1
Contact lenses absorb the tear film, and rub against the conjunctiva in the eyelids, which may cause or exacerbate dry eye. Long-term contact lens wear may decrease epithelial nerve sensation, which would reduce the stimulus to produce more tears.
The presence of ANY contact lens partially (or totally) numbs the surface of the cornea. Here's what happens. The delicate sensory nerves residing within the superficial cornea, (the tiny nerve fibers that sense smoke or overly chlorinated pool water), also sense very tiny changes in tear film chemistry (pH, osmolarity, etc.). These nerves automatically send the appropriate signal to the lacrimal glands: make less tears, make more tears. Loss of corneal sensation interrupts that critical tear feedback loop. Numb corneas don't send signals!
According to researches, there are no evidence that bandage lens help retain moister, on the contrary all researches determined it further dry the eyes and low content water lenses mean only that they suck less water, or in other words less harmful for your eyes. In fact, one of the disadvantage of contact lenses is that people are less likely to feel that their eyes are dry in part due to the fact the contact lenses wear may decrease epithelial nerve sensation. This of course would also reduce the stimulus to produce more tears. This also explain, why contact lenses wearer complained on DES when only when the discomfort becomes unbearable, and not sensitive to DES in the initial phase when it developing
has a lower prelens tear film elimination rate
http://findarticles.com/p/articles/mi_qa3921/is_200303/ai_n9178577/pg_4?tag=artBody;col1
Practitioners often use soft contact lenses as bandages for injured or post-surgical eyes. Use of a soft lens as a fluid reservoir for the dry eye patient is an appealing concept; in practice, however, lenses tend to dry out in the eye after a short while and are prone to falling out. The presence of a contact lens in the absence of normal tear flow may additionally increase the risk of ocular infection. The therapeutic benefits of a soft contact lens in true dry eye patients is minimal and may exacerbate symptoms.
Attempts to associate lens dehydration with comfort have failed to show a causal relationship between the two. Patients who have dryness symptoms tend to have greater dehydration of their lenses than do asymptomatic patients. Use of saline or lubricants can prevent dehydration, but it hasn't been possible to show that a decrease in the amount of dehydration is the cause of improvement in comfort associated with lubricant use. Nevertheless, it's common practice to prescribe lenses less prone to dehydration for patients who have dryness symptoms. Most practitioners believe that lower-water content lenses show less dehydration than higher-water content lenses; however, superiority is best evaluated case by case.
Copyright Boucher Communications, Inc. Mar 2003
Provided by ProQuest Information and Learning Company. All rights Reserved
Attempts to associate lens dehydration with comfort have failed to show a causal relationship between the two. Patients who have dryness symptoms tend to have greater dehydration of their lenses than do asymptomatic patients. Use of saline or lubricants can prevent dehydration, but it hasn't been possible to show that a decrease in the amount of dehydration is the cause of improvement in comfort associated with lubricant use. Nevertheless, it's common practice to prescribe lenses less prone to dehydration for patients who have dryness symptoms. Most practitioners believe that lower-water content lenses show less dehydration than higher-water content lenses; however, superiority is best evaluated case by case.
Copyright Boucher Communications, Inc. Mar 2003
Provided by ProQuest Information and Learning Company. All rights Reserved
Finally, MGD is even more prone to rapid evaporation than a regular DES patient, and the combination of both MGD and DES similar to what I have make it even more difficult. In summary, objectively, this might work for patients with corneal surface damage or with dry eyes related to contact lens wearing which isn't defined as 'true dry eyes', or that people are less likely to feel symptoms due to the reduced nerve sensation.
http://http://findarticles.com/p/art...g=artBody;col1
* Marginal dry eye. The second form of dry eye observed in noncontact lens wearers is commonly referred to as marginal dry eye. Though these individuals have symptoms of dry eye, objective testing is often inconclusive and doesn't reveal definitive signs of the disorder. This patient frequently complains of symptoms that manifest late in the day and increase in severity during the evening hours.
* Contact lens-induced dry eye. The marginal dry eye observed in contact lens wearers has several different names, including contact lens-induced dry eye (GLIDE) or contact lens induced sicca syndrome (CUSS). The dry eye contact lens patient differs from the true dry eye patient both in subjective complaints and in physical findings.
Most often the contact lens patient neither complains of ocular dryness nor exhibits clinical signs of dry eye when not wearing her lenses. Instead, she finds that symptoms of dryness limit her ability to comfortably wear lenses. In one report, the most frequent complaint of contact lens dry eye patients was dryness, followed by blurry and changeable vision. The true dry eye patient doesn't need contact lenses to stimulate symptoms; complaints are most frequently of dryness and soreness.
Attempts to associate lens dehydration with comfort have failed to show a causal relationship between the two. Patients who have dryness symptoms tend to have greater dehydration of their lenses than do asymptomatic patients. Use of saline or lubricants can prevent dehydration, but it hasn't been possible to show that a decrease in the amount of dehydration is the cause of improvement in comfort associated with lubricant use. Nevertheless, it's common practice to prescribe lenses less prone to dehydration for patients who have dryness symptoms. Most practitioners believe that lower-water content lenses show less dehydration than higher-water content lenses; however, superiority is best evaluated case by case.
* Contact lens-induced dry eye. The marginal dry eye observed in contact lens wearers has several different names, including contact lens-induced dry eye (GLIDE) or contact lens induced sicca syndrome (CUSS). The dry eye contact lens patient differs from the true dry eye patient both in subjective complaints and in physical findings.
Most often the contact lens patient neither complains of ocular dryness nor exhibits clinical signs of dry eye when not wearing her lenses. Instead, she finds that symptoms of dryness limit her ability to comfortably wear lenses. In one report, the most frequent complaint of contact lens dry eye patients was dryness, followed by blurry and changeable vision. The true dry eye patient doesn't need contact lenses to stimulate symptoms; complaints are most frequently of dryness and soreness.
Attempts to associate lens dehydration with comfort have failed to show a causal relationship between the two. Patients who have dryness symptoms tend to have greater dehydration of their lenses than do asymptomatic patients. Use of saline or lubricants can prevent dehydration, but it hasn't been possible to show that a decrease in the amount of dehydration is the cause of improvement in comfort associated with lubricant use. Nevertheless, it's common practice to prescribe lenses less prone to dehydration for patients who have dryness symptoms. Most practitioners believe that lower-water content lenses show less dehydration than higher-water content lenses; however, superiority is best evaluated case by case.