Intraocular Lens Power Calculation in Children

Comparison of IOL power calculation formulae for pediatric eyes

“…[4][5][6][7][8][9]11 Neely et al 7 reported a mean PE of 0.3 D (SD-1.5 D). They also reported that among the formulae tested, that is, SRK II, SRK-T, Holladay 1, and Hoffer Q, there was no significant difference.…”

“…[1][2][3] Several studies on children have shown larger errors in IOL formula predictions than that are found in adults. [4][5][6][7][8][9] Further, several authors have compared the accuracy of different IOL formulae designed for adult eyes in predicting early postoperative refractive error in eyes of infants and young children. 7,[9][10][11][12] However, there is no consensus as to which formula provides the best prediction of early postoperative refraction, particularly in the extremely small eye.…”

“…[4][5][6][7][8][9] Further, several authors have compared the accuracy of different IOL formulae designed for adult eyes in predicting early postoperative refractive error in eyes of infants and young children. 7,[9][10][11][12] However, there is no consensus as to which formula provides the best prediction of early postoperative refraction, particularly in the extremely small eye. In adult eyes, formulae that may have an advantage in terms of accuracy based on AL are: ALo22 mm: Hoffer Q, Holladay 2; AL 22-26 mm: Holladay I, Hoffer Q, SRK/T; AL426 mm: SRK/T, Holladay 2.…”

Paediatric intraocular lens implants: accuracy of lens power calculations

“…3,13 However, a theoretical analysis of prediction formulae including SRK/T and SRK-II for biometry data in the paediatric range showed differences in predicted implant powers with different formulae. 1 Amongst adult patients, SRK/T has been shown to be superior to the extent that the Royal College of Investigators who have examined the post-operative refractive results in paediatric cataract surgery have found a high degree of variability in results using SRK-II and SRK/T. [11][12][13] Mezer et al 15 compared the predictions of five formulae (SRK, SRK-II, SRK/T, Holladay 1 and Hoffer Q) in 206 primary and secondary lens implantations in children and found the results of all the formulae to be unsatisfactory.…”

“…1,2 Accurate prediction of post-operative refraction is required in order to avoid amblyogenic refractive errors, anisometropia and to allow refractive targeting to take into account the future growth of the eye. Lens prediction formulae in common usage today are based on theoretical models or on regression from normative data from adult eyes.…”