Zamora GIB, Fernández FKR, Hernández PE, González IY, Chang CP, Díaz ALR

Language: Spanish
References: 16
Page: 22-26
PDF size: 58.98 Kb.

ABSTRACT

Background: the implantation of intraocular lenses in cataract surgery represents a step forward in refractive correction of aphakia. Nevertheless, without a study prior to surgery and the correct calculation of the intraocular lens, the results would not be satisfactory.
Objective: To evaluate the biometric calculation and postoperative refraction in patients who underwent cataract surgery.
Methods: A descriptive study was conducted in the Ophthalmology Center of the State of Anzoategui in Venezuela. It included 250 patients who underwent cataract surgery with previous refraction, keratometry, biometry and intraocular lens power calculation. After surgery, the following parameters were determined: biometrically calculated expected refraction, postoperative refractive error, uncorrected visual acuity and postoperative correction.
Results: In general, females and patient between 60 and 69 years old predominated. The most commonly recorded value for keratometry ranged from 43 to 44 D. For axial length, values ranged from 22 to 24 mm. Most commonly used intraocular lenses were from 16 to 20 diopters and from 21 to 25 diopters. The largest percent of expected refraction was obtained in the group from 0.00 to 0, 50. Refractive error was predominant from 0.50 to 1.00. In the refraction performed without glasses one month after surgery, more than half of patients had vision between 20/30 and 20 / 25.
Conclusions: We demonstrated the effectiveness of intraocular lens calculation prior to cataract surgery.

REFERENCES

1. Cristobal JA, Ascaso FJ. Historia de la cirugía de catarata. En: Centurión V. El libro del cristalino de las Américas. Sao Paulo: Santos; 2007. p. 25-35.

2. Escobar Gómez M, Apple DJ, Vargas LG. Tribute to Sir Nicholas Harold Ridley: inventor of intraocular lenses. Arch Soc Esp Oftalmol. 2001;76(11):687-8.

3. Retzlaff J. A new intraocular calculation formula. J Am Intraocular Implant Soc. 1980;6(2):148-52.

4. Longstaff S. Factors affecting intraocular lens power calculation. Trans Ophthalmol Soc U K. 1986;105(Pt 6):642- 6.

5. Haigis W, Lege B, Miller N, Schneider B. Comparison of immersion ultrasound biometry and partial coherence interferometry for intraocular lens calculation according to Haigis. Graefes Arch Clin Exp Ophthalmol. 2000;238 (9):765-73.

6. Soler FL, Pascual J. Fuentes de error en la queratometría y biometría. En: Centurión V. El libro del cristalino de las Américas. Sao Paulo: Santos; 2007. p. 95-111.

7. Rose LT, Moshegov CN. Comparison of the Zeiss IOLMaster and applanation A-scan ultrasound: biometry for intraocular lens calculation. Clin Experiment Ophthalmol. 2003;31(2):121-4.

8. Shanbhag KN, Karandikar S, Deshmukkh P. IOL Calculations: When, How and Which?. En: Ashok Garg JT, Latkany R. Mastering the techniques of IOL power calculations. New York: McGraw-Hill; 2009. p. 234-8.

9. Ricardo Suárez FR, Álvarez Cancio M, Batista Hernández L, Carballo Hechavarría B, González Leyva M. Exactitud del cálculo del lente intraocular en pacientes del Centro Oftalmológico de Lara. Correo Med Cient Holguín[revista en Internet]. 2009[citado 23 Ene 2010];13(3):[aprox. 8 p.]. Disponible en: http://www.imbiomed.com.mx/1/1/articulos.php?method=showDetail&id_articulo=59959&id_seccion=2082&id_ejemplar=6057&id_revista=64.

10. 10.Fernández Soler FL, Segarra Pascual J. Cálculo de la lente intraocular: ¿Qué fórmula usar y por qué?. En: Alio JL, Rodríguez Prat JL. Buscando la excelencia en la cirugía de catarata. Barcelona: Editorial Glosa; 2006. p. 66-91.

11. 11.Ianchulev T, Salz J, Hoffer K, Albini T, Hsu H, Labree L. Intraoperative optical refractive biometry for intraocular lens power estimation without axial length and keratometry measurements. J.Cataract Refract Surg. 2005;31 (8):1530-6.

12. 12.Curtin BJ, Karlin DB. Axial length measurements and fundus changes of the myopic eye. Am J Ophthalm. 1971;71 (1 Pt 1):42-53.

13. 13.Aramberri J, Mendicute J, Ruiz M, Ostolaza J. Facoemulsificación con doble implante (piggyback) en el ojo corto. Microcirugía ocular. 1998;(2):55-60.

14. 14.Hernández Silva JR, Padilla González CM, Ramos López M, Ríos Cazo R, Río Torres M. Personalización de las fórmulas del cálculo de la lente intraocular. Rev Cub Oftalmol[revista en Internet]. 2004[citado 23 Ene 2009];17 (2):[aprox. 15 p.]. Disponible en: http://bvs.sld.cu/revistas/oft/vol17_2_04/oft07204.htm.

15. 15.Pérez Silguero D, Pérez Silguero MA, Pérez Hernández FR. Cálculo del lente intraocular en casos complicados: El método “Silguero”. Arch Soc Esp Oftalmol. 2005;80(10):589-96.

16. 16.Jarade EF, Abi Nader FC, Tabbara KF. Intraocular lens power calculation following LASIK: determination of the new effective index of refraction. J Refract Surg. 2006;22(1):75-80.