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Read Online or Download API RP 68 1st Ed. Jan. 1998 - Recommended Practice for Oil and Gas Servicing and Workover Operations Involving Hydrogen Sulfide PDF
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Additional info for API RP 68 1st Ed. Jan. 1998 - Recommended Practice for Oil and Gas Servicing and Workover Operations Involving Hydrogen Sulfide
Sample text
Bilaterality Approximately 15% of detachment patients ultimately develop detachment in the second eye. The effect on bilaterality of prophylactic treatment, such as cryopexy of retinal breaks in the second eye at the time of detachment in the fi rst eye, has not 400 Aphakia 370 383 Number of eyes Phakia 300 200 168 134 100 49 65 44 26 16 0 0 10 20 30 40 50 60 Age (years) 70 80 90 Figure 2–23. Age distribution of retinal detachment patients with small juvenile mode and prominent middle-age mode.
Localized contracture in the periphery is referred to as a star fold (Figure 2–25), and a similar process in the posterior pole is referred to as a macular pucker (Figure 2–26). Two more recent classification systems for PVR have come into use and, though imperfect, they have improved our evaluation of retinal detachment and its therapy (see Chapter 5, page 104). Figure 2–24. Total retinal detachment associated with proliferative vitreoretinopathy (PVR). The retina is pulled into fi xed folds by the membranes on the surface of the retina.
Traumatic detachments are most common in youth, myopic detachments occur most frequently among people older than 25, and the incidence of pseudophakic detachments rises with each decade of advancing age (Figure 2–22). The risk factors are not mutually exclusive, and highly myopic eyes with lattice degeneration that undergo cataract surgery appear to be at relatively high risk. 90 Trauma Retrolental fibroplasia Inferior temporal dialysis Myopia Aphakia 80 Relative frequency (%) 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 Age (years) Figure 2–22.