If a cataract remains in the eye for a very long time, the cataractous lens can create serious secondary problems. However, before this would occur, loss of vision acuity would severely affect your everyday activities such as reading or driving.
For more information from another health site, please visit the following webpages:
Digital Reference of Ophthalmology, Hypermature Cataract
Complications of Hypermature Cataract and Its Visual Outcome