How to measure the usable corridor width with progressive spectacle lenses

Progressive spectacle lenses are an attractive option over the older bifocal lens designs. However, progressive lenses have their own challenges and they demand greater accuracy in lens positioning and optical dispensing.

One of the biggest problems is when progressive lens performance is not as expected, such that the patient experiences problems with a small or narrow field of view for reading. The download on this website is an explanation of how to use the ‘Usable Corridor Width Scale’.

TIP: Print the notes and use these for staff training. The results will help staff to understand whether the horizontal lens positioning is too wide or too narrow; and which lens (R or L) has the error.

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