Historic largest series of eyes reporting the biometry (axial length, corneal power, astigmatism and anterior chamber depth) on 7,500 eyes published in the AJO in 1980 by Kenneth J Hoffer, MD.

Invited Editorial on a review of the various methods to deal with calculating IOL power in eyes that have had laser refractive surgery. Published in 2009.

2006 study of TechnoMed exact power-labeled IOLs performed by the lab at the US FDA.  Shows there is a small benefit in accuracy especially in higher powered IOLs.

This 1993 study provides evidence of the immersion A-scan crystalline lens thickness (LT) and variations due to age and axial length in cataractous eyes.  Series is large that data can be used in estimating LT for formulas.

Hoffer Q Formula Erratum JCRS 2007

2000 study of 317 eyes by one surgeon using one IOL style and the Holladay IOL Consultant to compare the accuracy of the Holladay 2 with the Hoffer Q, Holladay 1 and SRK/T.  The results show that the Holladay 2 is less accurate than the Holladay 1 or Hoffer Q in the normal range of eyes (22-26 mm.) It equalled the Hoffer Q in eyes shorter than 22 and the SRK/T in eyes longer than 26 but requires 6 pieces of data rather than the usual AL and K.

My first paper about IOL power calculation. It allowed me to join the IPC. Soon after its publication, in fact, Ken wrote me for the first time and we got in touch.

As presented at the 2008-11 IOLPC meeting, this presents a method for optimizing IOL power distribution for humanitarian missions, using statistical modeling.

Hostorical documentation of the barrier ridge effect (sharp edge) for IOLs to decrease PCO.

Hoffer KJ

As presented at the 2008-11 IOLPC meeting, this presentation describes the updated logarithmic model of refractive growth in children. (Publication pending)

Although corneal topography and the Pentacam provide similar SimK values, their data should not be used interchangeably as only moderate agreement exists between them. Corneal power values calculated by the True net power are signifi cantly lower than any SimK and cannot be entered into intraocular lens power formulas.

Study was to prospectively evaluate keratometry (K) values obtained by Scheimpflug photography in eyes scheduled for cataract surgery, compare the results with K values obtained with an autokeratometer (automated K), and evaluate the K values in commonly used intraocular lens (IOL) power calculation formulas for routine cataract surgery. The K values from Scheimpflug photography did not improve accuracy over autokeratometer values for routine IOL power calculation.

Study performed at the Jules Stein Eye Institute UCLA comparing the Holladay EKR of the Pentacam (ver 1.16r04) with back-calculation of the true K power. Twenty-seven patients (41 eyes) were evaluated; 26 eyes had previous LASIK or PRK and 15, previous RK. 41 eyes served as controls. The mean error of the Holladay EKR in eyes with previous LASIK or PRK was +1.84 diopters (D) (range +0.66 to +4.94 D). The mean error in eyes with previous RK was 2.17 D (range +0.48 to +3.09 D). In the control eyes, the mean EKR error was +1.38 D (range -0.17 to C2.54 D).