Corneal shields

O Brien, T.P., et al. 1988. Use of collagen corneal shields versus soft contact lenses to enhance penetration of topical tobramycin. J Cataract Refract Surg 14 505. 

Sawusch, M.R., T.P. O Brien, and S.A. Updegraff. 1989. Collagen corneal shields enhance penetration of topical prednisolone acetate. J Cataract Refract Surg 15 625. 

Grammer, J.B., et al. 1996. Impregnation of collagen corneal shields with liposomes Uptake and release of hydrophilic and lipophilic marker substances. Curr Eye Res 15 815. 

Z.P. Huang, and J.A. Wu, An experimental study of gentamycin dehvery into cornea and aqueous humor from the collagen corneal shield. Chin. J. Ophthalmol, 28,170-2,1992. 

Health Hazards Information - Recommended Personal Protective Equipment Goggles or face shield, rubber gloves Symptoms Following Exposure Inhalation causes headache, nausea, and irritation of nose and throat. Vapor irritates eyes liquid causes inflammation and corneal opacity. Contact of skin with liquid causes dryness and irritation. Ingestion causes headache, nausea, and irritation of mouth and... 

The collagen shield, fabricated from procine scleral tissue, is a spherical contact lens-shaped film whose thickness can be made to vary from 0.027 to 0,071 mm. It has a diameter of 14.5 mm and a base curve of 9 mm. Once the shield is hydrated by tear fluid and begins to dissolve, it softens and conforms to the corneal surface. Dissolution rates can be varied from 2 to as long as 72 hr by exposing the shields to ultraviolet radiation in order to achieve varying degrees of crosslinking. 

Homof M, de la FM, Hallikainen M, Tammi RH, Urtti A (2008) Low molecular weight hyaluronan shielding of DNA/PEI polyplexes facilitates CD44 receptor mediated uptake in human corneal epithelial cells. J Gene Med 10 70-80... 

Silbiger, J., and G.A. Stern. 1992. Evaluation of corneal collagen shields as a drug delivery device for the treatment of experimental Pseudomonas keratitis. Ophthalmology 99 889. 

Chen, Y.F., et al. 1990. Cyclosporine-containing collagen shields suppress corneal allograft rejection. Am J Ophthalmol 109 132. 

Porcine collagen shields, which are designed to promote corneal healing and provide lubricity to the eye. 

Figure 26-28 If a patient is referred for consultation due to a suspected corneal penetrating injury, it is appropriate to tape a metal Fox shield over the eye to protect from further trauma during transportation. Tape is placed over the edge of the Fox shield to enhance patient comfort (here shown partially completed).

Emla cream 30 g was applied to both periorbital and proximal nasal sidewall areas for laser treatment in a 20-year-old woman. Despite the use of a right eye shield for corneal protection, the next day she developed right eye pain and blurred vision and remembered that Emla cream had accidentally entered her right eye before treatment. This caused immediate discomfort, which subsided and then recurred several hours later. She had severe conjunctival injection with loss of epithelium from over 90% of the surface of her cornea, in a pattern more suggestive of chemical than mechanical damage. Treatment with a bandage contact lens and prophylactic antibiotics was effective and her visual acuity returned to basehne. 

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