Corneal infiltrates associated with soft contact lens wear.
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Contact Lenses, Hydrophilic↗
Biomedical subjects
Peter C Donshik
Publications and source records attributed to Peter C Donshik.
Extended wear contact lenses.
Practitioners and patients have been hesitant to use extended-wear contact lenses because of their history of complications; however, there is strong scientific evidence that the hypoxia problems associated with these lenses have been solved. Similarly, clinical evidence shows that the new generation of contact lenses is safe and can be worn without complications for up to 30 days. Patients are now able to wear contact lenses that meet their desire of continuous vision. Both practitioner and patient, however, must be instructed about the signs and symptoms of contact lens complications. Practitioners need to learn about the diagnosis and management of these problems, and patients must be educated about proper eye care, contact lens care, and appropriate follow-up.
Contact Lenses, Extended-Wear↗
Disposable and frequent replacement contact lenses.
Disposable and frequent replacement contact lenses dominate the marketplace. They are available in a wide variety of parameters for use in refractive errors, including myopia, hyperopia, astigmatism, and presbyopia. They are convenient and affordable and lend themselves to most wearing modalities, including daily wear, flexible wear, and extended wear for up to 30 days. In addition, they have been shown to be the most trouble-free contact lens wear modality for daily wear or extended wear. They are an appropriate choice for patients who desire occasional contact lens wear and have gained wide acceptance as therapeutic bandage contact lenses. Disposable and frequent replacement lenses will remain important modalities for some time to come as the variety of contact lenses and contact lens parameters that are offered continue to expand. New contact lens varieties, such as the high-Dk silicone hydrogel lenses, will further expand the role of these contact lenses in vision correction.
Contact Lenses↗
Contact lens chemistry and giant papillary conjunctivitis.
OBJECTIVE: To review the relationship between contact lens chemistry and the occurrence of giant papillary conjunctivitis (GPC). DESIGN: A review of the literature. RESULTS: GPC can occur with any type of contact lenses. The coating on the lens and the contact lens trauma to the conjunctiva are probable factors. Changing the polymer of the contact lens that a patient with GPC wears can decrease the chance of the condition recurring. Also, replacing a soft contact lens at intervals of less than 3 weeks, rather than 4 or more weeks, significantly reduces the chance of developing GPC. GPC can occur with high Dk silicone contact lenses. Two forms of GPC have been reported: a generalized form similar to that seen with conventional soft contact lenses and a localized form in which the papillae are confined to one or two areas of the tarsal conjunctiva, near the lid margin. CONCLUSION: Contact lens chemistry plays a role in the development of GPC; however, other factors such as edge design, surface properties, fitting characteristics, and replacement cycle are also important variables in the pathophysiology of GPC.
Chemical Phenomena↗
Contact lenses. Preface.
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Contact Lenses↗
Extended wear contact lenses.
The experience with the complications associated with extended wear contact lenses has made practitioners and patients fearful of this modality. Today, strong scientific evidence suggest that the hypoxia problems associated with extended wear lenses have been solved. Good clinical evidence suggests that the new high-Dk silicone lenses are safe and can be worn successfully for up to 30 days. Patients can now be offered contact lenses that meet their desire of continuous vision; however, practitioners and patients must be instructed regarding the signs and symptoms of contact lens complications. Practitioners need to be educated in the diagnosis and management of the complications. Patients need to be educated about the need for proper eye care, contact lens care regimens, and appropriate follow-up visits.
Contact Lenses, Extended-Wear↗