A Study Regarding Efficacy Of Various Intraocular Lens Power Calculation Formulas In A Subset Of Indian Myopic Population
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Hoffer q formula. East valley ophthalmology 5620 east broadway road mesa arizona 85206 tel. Arizonas top eye doctors east valley ophthalmology provides this online information for educational and communication purposes only and it should not be construed as personal medical advice. Abstract a new formula the hoffer a was developed to predict the pseudophakic anterior chamber depth aco for theoretic intraocular lens iol power formulas.
It relies on a personalized acd axial. A comparison of theoretic and regression formulas kenneth j. It relies on a personalized acd axial length and corneal curvature.
Barrett uses five and the holladay ii uses seven. A third category is formulas based on artificial intelligence he continues. When we used the hoffer q formula as published in the formula appendix 1 the calculated iol power was incorrect compared with the power calculated by the zeiss iolmaster 302 and the quantel medical axis ii.
A new formula the hoffer q was developed to predict the pseudophakic anterior chamber depth acd for theoretic intraocular lens iol power formulas. For the srkt hoffer q and holladay 1 formulas 14 16 the single k and double k values were calculated by using the post lasik and pre lasik k readings for the elp prediction respectively. The ones that most doctors usethe holladay i srkt and hoffer qonly use two variables.
In 180 eyes the q formula proved more accurate than those using a constant a. 2 a more recent. 2 in 2000 he showed that the holladay 2 was comparable to the srkt in these eyes.
Found that the hoffer q formula was more accurate than the holladay 1 and srkt formulas in a study of 134 eyes with an axial length of less than 2150 mm. 7 the accuracy of the srkt has since been. Of the third generation formulae i tend to prefer the holladay 1 in most eyes reserving the hoffer q for short eyes with an axial length less than 22 mm and the srk t for long eyes with an axial.
Currently the only formula in that category is the hill rbf which is based on. In both of the single and double k versions the post lasik k reading was used in the vergence portion of the formulas. Historically as noted above with short eyes hoffer showed in 1993 that the srkt formula would provide more accurate iol power prediction in eyes over 26 mm compared with the hoffer q and the holladay 1 formulas.
The single k and double k versions of each iol calculation formula. It relies on a personalized aco axial length and corneal curvature. The hoffer q formula.
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