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Scientific News

Explore the latest results, studies, and publications from the field of optical biometry.
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AT LISA tri Provides Significantly Better Intermediate Visual Acuity

Gundersen et al. conducted a postintervention diagnostic evaluation to compare the visual acuity and quality of vision between bilateral implantation of a trifocal IOL (AT LISA tri 839MP) and blended bifocal IOL (ReSTOR +2.5/+3.0. The AT LISA tri from ZEISS provided significantly better intermediate visual acuity in the viewing distance range of 2 m to 67 cm. Clinical Ophthalmology 2016;10: 805-811

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Comparison of Corneal Diameter and ACD Measurements Using 4 Different Devices

In a recent study Kohnen et al. evaluated the reliability and validity of anterior chamber depth (ACD) and corneal diameter measurements of 4 different devices. ACD and white-to-white distance were measured with Pentacam HR, IOL Master 500, LenStar 900, and Visante OCT. Unlike previous research the authors found no significant difference between the measurements. Cornea. 2016;35(7): 838-42

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Key Developments in PCI and OCT in the Human Eye in Vienna

Partial coherence interferometry (PCI) as the basic ranging technology for modern optical biometry and for optical coherence tomography (OCT) was introduced for biomedical applications in the 1980s. The aim of the recent article of Hitzenberger et al. is to describe key developments of optical biometry and OCT for ophthalmic applications. Therefore the article provides an overview of key developments in PCI and OCT and helps to establish both technologies as the gold standards in their respective fields. IOVS July 2016, Vol.57, OCT460-OCT474

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Might the IOLMaster's 700 Retina Scan Be Useful for Screening Macular Pathology?

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One common challenge before cataract surgery is to detect and document macular disease. In a recent study published in JCRS, Nino Hirnschall et al from Hanusch Hospital, Vienna (Austria) assessed the IOLMaster 700 in terms of sensitivity and specificity for detecting macular disease with its swept-source OCT scan during routine biometry. Also, all eyes were assessed using a dedicated retinal OCT device (RTVue).

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Microscope Integrated Intraoperative SD-OCT for Cataract Surgery

Research of Das et al. demonstrated the uses and applications of ZEISS RESCAN 700 in Micro Incision Cataract and Femtosecond Laser Assisted Cataract Surgery. The RESCAN™ 700 showed a very promising role for both of these technologies in the future for cataract surgery. Find out more on PubMed.

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The Effect of Pupil Dilation on Biometry Data and IOL Power Calculation by Using the IOLMaster

In a study including 384 eyes from 195 healthy volunteers the biometric variation of axial length (AL), flattest and steepest keratometry (K1, K2)), and anterior chamber depth (ACD) before and after pharmacologic pupil dilation was measured by the IOLMaster. For both measurements the prediction for IOL power based on the SRK/T formula was calculated. AL and K variation was not significant, whereas ACD increased significantly after dilation. IOL power calculation was not affected by pupil dilation because ACD is not used in the SRK/T formula. Go to the abstract on PubMed to find out more.

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Update on Cataract Surgery Benchmarking

Cataract surgeries performed in the UK between 2006 and 2010 are investigated in terms of outcomes, intraoperative and postoperative complications in a database study. This analysis provides useful data allowing cataract surgery benchmarking. Go to the free full text on journal Eye to find out more.

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Comparison of biometry values taken by various ophthalmic devices

Measurement errors of 24 different ophthalmic devices were compared using Pentacam, Orbscan and the IOLMaster as a reference. Only a minority of the results were equivalent which directly affects clinical studies or patient follow-ups using different devices. Read this abstract on PubMed to find out more.

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Foveal Pit Morphology Evaluation

Evaluating the foveal pit morphology during optical biometry measurements using swept-source OCT scan provides useful information for subsequent patient examination and further treatment planning for cataract surgery. These are the findings of a research project comprised of 146 eyes of 146 patients - phakic (group I) and pseudophakic (group II) - and conducted at Marburg University by T. Bertelmann et al. These findings were first presented at ESCRS 2014 and recently published in the European Journal of Ophthalmology.

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