Making sure it all measures up

Carl Zeiss' Sofia Fazal shares her top tips for taking accurate measurements when dispensing progressives

Man wearing glasses

Taking measurements in practice can be a real challenge at the best of times, but the critical nature of progressive lens positioning means that getting it right first time is the key to success and ultimately the satisfaction of the patient. Here are eight factors to consider that will help avoid non-tolerance cases.

  1. For existing progressive lens wearers, it is advisable to assess their existing glasses by identifying the brand and type of lens along with the position of the fitting cross
  2. Fully elicit the wearer’s history and needs/concerns and lifestyle/work demands
  3. Lens options should be outlined fully and decided upon prior to frame selection. Key features and how the selected lenses will provide solutions to the earlier discussed needs/concerns should be highlighted
  4. Identify the patient’s preferences in terms of frame shapes and styles and then provide guidance on suitable options to meet their needs
  5. Ensure that the patient wears the chosen frame in their preferred position and holds their head in a natural position
  6. Make any frame adjustments prior to taking any measurements
  7. Accurately measure monocular pupillary distances and fitting heights, and where appropriate, specify the back-vertex distance, pantoscopic tilt, frame wrap, corridor length, and near working distance
  8. Digital centration devices capture all of the measurements required for individualisation in less than one minute with a very high degree of accuracy.

Image credit: Getty/Vasyl Dolmatov