Below you'll find a list of all posts that have been tagged as “Lens design”
Empirical lens fitting is controlled entirely by the lab which makes it analogous to the ‘auto’ or ‘P’ button that has become common on digital cameras. In other words, a good outcome will be achieved most of the time, but like the auto camera setting, it will do a bad job if you fall outside of its normal range of …
Inventory sets typically contain a large range of over 100 lenses that have different base curves and sag heights. The commonality across these designs is that changing the base curve alters the amount of refractive change made while changing sag height alters the fit. Make the base curve flatter to increase the myopic correction change. Increase the sag height and …
Relative to inventory systems, trial lens-based designs make a compromise in only containing a range of lenses with different sag heights to reduce the number of lenses to only around 25 that need to be stocked. In a sense this makes them synonymous with many rigid contact lens trial sets in that they provide just enough lenses for you to …