Caution should be practised when using the device’s ACD measurement for any given intraocular lens
calculation because of the high variability of this measurement.
The ACD measurement is the distance between corneal epithelium and the crystalline lens surface.
Aladdin has an onboard PC with the dedicated software that provides all the functionalities described.
The information obtained from the measurements can be used for various applications, for example: Cataract
operations, IOL calculation, IOL toric calculation and post lasik calculation.
The intraocular lens power suggestion is made using scientifically recognised formulae: Holladay 1, Haigis,
Hoffer Q, SRK / T, SRK II, Camellin-Calossi, Shammas No history.
The Haigis, HofferQ, Holladay, SRK® II and SRK®/T formulae are implemented in the software.
Please refer to the following literature references on the formulae (in case of specific questions please
contact Visia Imaging):
• Haigis: http://www.augenklinik.uni-wuerzburg.de/uslab/ioltxt/haid.htm
• HofferQ: HOFFER KJ: The Hoffer Q formula: A comparison of theoretic and regression formulas.
J Cataract Refract Surg, 19:700-712, 1993; ERRATA 20:677, 1994
• Reply: Errata in printed Hoffer Q formula. Journal of Cataract & Refractive Surgery, Volume 33,
Issue 1, Pages 2-3, January 2007, Authors:Kenneth J. Hoffer, MD
• Holladay: HOLLADAY JT, PRAGER TC, CHANDLER TY, MUSGROVE KH, LEWIS JW, RUIZ RS: A three-
part system for refining intraocular lens power calculations. J Cataract Refract Surg, 14:17-24,
1988
• SRKII: RETZLAFF J: A new intraocular lens calculation formula, Am Intra-Ocular Implant Soc J
6:148-152, 1980
• SRK/T: RETZLAFF J, SANDERS DR, KRAFF MC: Development of the SRK/T intraocular lens implant
power calculation formula. J Cataract Refract Surg 16 (3):333-340, 1990
Correction of corneal radii/corneal refraction after corneal refractive surgery:
• HOLLADAY JT: IOL calculations following RK. Refract Corneal Surg 5(3):203, 1989
• HOFFER KJ: Intraocular lens power calculation for eyes after refractive keratotomy. J Refract Surg
11:490:493, 1995
Calculation of phakic implants:
• vd HEIJDE GL, FECHNER PU, WORST JGF: Optische Konsequenzen der Implantation einer
negativen Intraokularlinse bei myopen Patienten. Klin MB1 Augenheilk 192:99-102, 1988
• HOLLADAY JT: Refractive power calculations for intraocular lenses in the phakic eye. Am J
Ophthalmol 116:63-66, 1993
• HAIGIS W: Biometry in complicated situations, 9th Conv. of DGII 1995, Rochels et al (Hrsg.),
Springer, 17-26, 1996
Relations between ultrasound and optical biometer calculation constants:
• RETZLAFF J, SANDERS DR, KRAFF MC (1990): Lens Implant Power Calculation - A manual for
ophthalmologists & biometrists, 3rd edition, Slack Inc, Thorofare NJ, USA
• HAIGIS W, LEGE B, MILLER N, SCHNEIDER B: Comparison of immersion ultrasound biometry and
partial coherence interferometry for IOL calculation according to Haigis, Graefes Arch Clin Exp
Ophthalmology (2000) 238:765-773
To Next Page
Loading...
