الفهرس 
Aim of The WorkOnly 14 pages are availabe for public view
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Abstract
Cataract surgery is one of the most frequently performed ophthalmic surgical procedures. The last surgical techniques and the accurate devices that calculate the intraocular lens (IOL) power have made possible to achieve a good refractive outcome.
Nevertheless, a precise IOL calculation is not easy, depending on several parameters, such as axial length (AL), anterior chamber depth, keratometry and IOL power calculation formula.
Accurate AL measurement has been demonstrated to be the main factor for IOL power calculation, highlight related with the ocular biometry. Optic biometry, based on the partial coherence interferometry (PCI), is one of the most performed techniques in the last years to AL measurement prior to cataract surgery with accurate results.
However, it is necessary to take into account that PCI uses the same group (mean) refractive index of the crystalline lens for all cataract grades. It seems that this group refractive index could vary with cataract grade, being higher as cataract grade increases.
For this reason, dense cataracts could induce a significant bias in AL value determined with PCI biometry or even fails the acquisition procedure. Nevertheless, it is not entirely clear to what extent moderate cataracts affect AL measurements. Nowadays cataract tend to be operated earlier, so moderate cataract are the most extracted, while years ago it was more frequent to wait until the cataract was more dense. For this reason, it is important to study the influence of moderate lens opacity in AL measurements.
The objective of this study was to compare the AL value measures with IOL master, before and after uncomplicated cataract surgery, correlated with the type and intensity of cataract, evaluated with the Lens Opacities Classification System (LOCS III).
This was a Prospective case series carried out on 50 cataractous eyes, in Alnour eye hospital.
This study was included the following visits: baseline (before cataract surgery), surgery day and one month after surgical intervention. The first and the last visits were used to register the AL measures with IOL master.
Also, for grading lens opacity the Lens Opacities Classification System (LOCS III) was used in the baseline visit.
The results of this study showed that there was no significant difference between pre and post operative axial length, while there was a significant increase in K-reading post operative. Also the ACD show a significant increase post operative from pre operative measurements.