title: [Development of ophthalmologic software for handheld devices].
abstract: BACKGROUND
  The formulas for calculation of intraocular lenses have evolved since the first theoretical formulas by Fyodorov. Among the second generation formulas, the SRK-I formula has a simple calculation, taking into account a calculation that only involved anteroposterior length, IOL constant and average keratometry. With the evolution of those formulas, complexicity increased making the reconfiguration of parameters in special situations impracticable. In this way the production and development of software for such a purpose, can help surgeons to recalculate those values if needed.
  
  
  OBJECTIVE
  To idealize, develop and test a Brazilian software for calculation of IOL dioptric power for handheld computers.
  
  
  METHODS
  For the development and programming of software for calculation of IOL, we used PocketC program (OrbWorks Concentrated Software, USA). We compared the results collected from a gold-standard device (Ultrascan/Alcon Labs) with the simulation of 100 fictitious patients, using the same IOL parameters. The results were grouped for ULTRASCAN data and SOFTWARE data. Using SRK/T formula the range of those parameters included a keratometry varying between 35 and 55D, axial length between 20 and 28 mm, IOL constants of 118.7, 118.3 and 115.8.
  
  
  RESULTS
  Using Wilcoxon test, it was shown that the groups do not differ (p=0.314). We had a variation in the Ultrascan sample between 11.82 and 27.97. In the tested program sample the variation was practically similar (11.83-27.98). The average of the Ultrascan group was 20.93. The software group had a similar average. The standard deviation of the samples was also similar (4.53).
  
  
  CONCLUSIONS
  The precision of IOL software for handheld devices was similar to that of the standard devices using the SRK/T formula. The software worked properly, was steady without bugs in tested models of operational system.
authors.affiliation: Departamento de Informática em Saúde, Universidade Federal de São Paulo, São Paulo, SP, Brasil.
authors.forename: Gustavo Teixeira
authors.initials: GT
authors.lastname: Grottone
authors.forename: Ivan Torres
authors.initials: IT
authors.lastname: Pisa
authors.forename: João Carlos
authors.initials: JC
authors.lastname: Grottone
authors.forename: Fernando
authors.initials: F
authors.lastname: Debs
authors.forename: Paulo
authors.initials: P
authors.lastname: Schor
mesh_terms: D034201:Computers, Handheld; D006801:Humans; D007910:Lenses, Intraocular; D055095:Optics and Photonics; D012029:Refraction, Ocular; D012031:Refractometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012985:Software Design; D018709:Statistics, Nonparametric