292 CHAPTER SEVEN TABLE 7-38. DISTRIBUTION OF CORNEAL OPACITIES BY ZONE AMONG ADULTS AGES 15 OR OLDER (NBS 1981) Estimated Population with Corneal Opacity Percentage of All Corneal Opacities in Nepal Estimated Prevalence per 100 Sample N Zone Mechi Koshi Sagarmatha Janakpur Bagmati Narayani Gandaki Lumbini Dhaulagiri Rapti Karnali Bheri Seti Mahakali Subtotal Missing corneal 1,358 2,058 2,121 2,408 2,453 2,289 1,895 2,135 282 1,152 314 1,687 970 1,302 22,424 5,266 9.749 7,188 14,287 10,622 9,893 7,508 16,836 627a 7,656 3,809 19,582 9,799 9,250 132,071 1.1 1.3 1.0 1.6 1.1 1.1 1.1 2.1 0.6 1.8 3.1 3.4 2.9 1.6 1.6 4.0% 7.4 5.4 10.8 8.0 7.5 5.7 12.7 0.5 5.8 2.9 14.8 7.4 7.0 100.0 opacity status 19 22,443 --- Total 132,071 1.6 100.0 Source: FRANY.001 AN.33 REP.V304.1 aToo few cases to be reliable. with the distribution of the 53,170 trichiasis and entropion cases among adults shown in Table 7-39. Corneal opacities are related to trachoma only in trachoma endemic areas. The zones in the East, Central, and West regions generally have too few cases of trichiasis and entropion found in the survey to provide reliable estimates for trichiasis and entropion prevalence. Lumbini zone in the West region does not have high enough levels of trichiasis and entropion to warrant introduction of mobile surgical units, despite a high prevalence of corneal opacities. Among the five zones in the Far West region displayed in Table 7-39, all of which had corneal opacity prevalence rates within the WHO-suggested range, Rapti and Karnali zones have trichiasis and entropion prevalence rates below the WHO-suggested level; surgical intervention in these zones is not recommended. The remaining three zones, Karnali, Bheri, and Seti, all have trichiasis and entropion prevalence rates among adults greater than 1.0 percent (all are actually greater than 2.0%), and they have corneal opacity prevalence rates greater than 2.0 per-
