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Advanced Analysis of Defocus Curve Results

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...

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The Area Under the Defocus Curve with MLA

The Defocus Curve provides a great deal of information that sometimes can be difficult to interpret by looking at the results for each single defocus step. For example, when we measure visual acuity at near (40 cm) we only have one result at a distance but when we measure a defocus curve we can...

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Why do we measure the defocus curves at 2 m or 4 m and not at 6 m?

A frequent question asked is why the Multifocal Lens Analyzer is designed to measure Defocus Curves at 2m or 4m and not at 6m which is considered the standard distance for measuring refraction. To explain the reason it is important to have the following concepts: Changing optotype size is...

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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). There are three fundamental points that we have to take into account before starting...

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Validated Apps for Testing Vision

I recently read the manuscript ‘Undermining a common language: Smartphone applications for eye emergencies’, I prepared a Letter to the Editor for clarifying some issues about our Apps for testing vision. Unfortunately, the editor answered that no letters were admitted after one month of publication...

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