Lens Troubleshooting

Question: I have a lens that seems to have an aberration?

Possible Cause #1: Contaminants on the lens

Solution: Before annealing – If the lens is not properly cleaned before the annealing step, the contaminants may cause an optical defect. Carefully clean all lenses before annealing.

After annealing – A common error that can cause a defect is for an operator to lift up the lens from underneath with a fingertip when removing from the annealing stage of the Post Cure chamber. This can leave a permanent mark on the lens where touched, particularly if there was any lens monomer on the gloved fingertip. When removing the lens from the annealing stage, remember to handle the edges only.

Possible Cause #2: Pre-released lens

Solution:  Improper mold cleaning – Follow proper mold cleaning and preparation procedures.

Improper job queuing – If a job is run out of order, the initial curing step may cause the wrong amount of light to be directed toward the mold assembly, resulting in an increased possibility of a pre-release. Always follow the proper production sequence.

Wrong mold or gaskets selected – If the wrong mold or gaskets are used, the lens will be too thick or thin. Make sure to double check your mold and gasket selection as part of the production process.