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Tables for Visual Acuity Conversion

In this article you will find tables for converting between different visual acuity notations commonly used in clinical practice or scientific research. Please use always standard ETDRS charts and logMAR notation.

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BigSIA. Computing Surgically Induced Astigmatism by Incisions after Surgery

The incision required for IOL implantation during cataract surgery induces astigmatism, which is called surgically induced astigmatism (SIA). The BigSIA application allows you to calculate the induced corneal astigmatism.

Optimum Distance to measure a Defocus Curve

It is important to take into account that changing optotype size is not the same that correcting vergence by proximal distance. This is a concept that generates confusion as we have seen in many of the courses we have conducted about Defocus Curves.

Preparing the lenses to measure a Defocus Curve

In this article we will explain the lens preparation procedure to be carried out before starting to measure a Defocus Curve, in general with any test, and in particular with the Multifocal Lens Analyzer PRO (MLA).

Near and Intermediate Visual Acuity in Clinical Studies with Multifocal Intraocular Lenses

Failure to understand the purpose of why certain visual performance measures are taken can lead to the development of clinical trial protocols with long duration and therefore unreliable data due to patient fatigue.

The Area Under the Defocus Curve

The Defocus Curve provides a wealth of information that can sometimes be difficult to interpret by looking at the results for each defocus in isolation.

Advanced Analysis of the Defocus Curve

Defocus curve offers comprehensive information about what is the mean behavior of a multifocal procedure. However, a non-optimal analysis of the obtained data can lead to misinterpretation of the results. In this article, we are going to cover two problems in the statistical analysis of defocus curves.

Intraocular Lens Constant Fitting

This article discusses the fitting of the constant in intraocular lens (IOL) calculation. It highlights the technological evolution and the concept of Effective Lens Position (ELPo). It presents vergence and thick lens equations, and mentions the Haigis formula with multiple regression.

Which Contrast Sensitivity test to use in Simultaneous Vision Treatments?

Optimal tests for measuring Contrast Sensitivity with Simultaneous Vision optical systems, such as Intraocular Lenses or Multifocal Contact Lenses.

Cumulative Visual Acuity in Laser and Cataract Surgery

Defocus Curves: Fast Measurement with Multifocal Lens Analyzer

Multifocal Lens Analyzer (MultifocalLA) is a professional APP, useful in the practice of Ophthalmology and Optometry, to measure Visual Acuity Defocus Curve and Contrast Sensitivity Defocus Curve in multifocal procedures (Intraocular Lenses, Contact Lenses and Laser Surgery).

Contrast Sensitivity Test Validated for iPad: ClinicCSF

ClinicCSF is an application available for iPad and validated to measure Contrast Sensitivity Function at various distances.

ETDRS Chart for iPad (VisionC)

VisionC is the first fully configurable ETDRS optotype chart to be presented at any distance from 20 cm to 400 cm (in 1 cm steps) and for any contrast from 0 to 100% (1% steps).

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