CATARACT PATIENTS IN A DEFINED SWEDISH POPULATION 1986-1990 .2. PREOPERATIVE OBSERVATIONS

With the Cataract Analysis System (CAS(TM)) we have analyzed 5.878 con secutive patients undergoing cataract operations from 1986 through 199 0. The material is complete enough to be regarded as representative of the cataract surgery performed in the Lund Health Care District catar act surgery referral region during this period. There has been a strik ing increase in the number of operations, in 1990 reaching 3.6 per 100 0 inhabitants in the referral region. A number of demographic factors have been analyzed previously, and the preoperative status of the pati ents is reported in this paper. In 1986, the cataract patients showed more visual impairment than in 1990, but the average age at surgery di d not change between the years. We therefore suggest that the increase in the number of patients which were operated on represents a new cat egory that was added. During the period, the planned refraction has ch anged towards emmetropia, presumably reflecting several kinds of impro vements in the procedure. About 78 per cent of the population had a pr eoperative astigmatism < 1.5 D. As expected males had slightly longer eyes than women, and their corneal curvature was also slightly less.