Scleral lenses have two basic features that are commonly perceived as disadvantages, these being their large size and Sclera bearing surface. However, these features should actually be recognised as providing the following positive benefits :

• Because Scleral lenses bear on the sclera, they do not depend on precise alignment to the corneal surface. Therefore even highly irregular corneal topography can be fitted with some kind of scleral lens
• They are almost never dislodged because they fit under the eyelids
• They are dimensionally stable, robust and not subject to much deterioration
• Insertion and removal is easier for clumsy patients, eg elderly aphakics who do not have an implant for some reason
• Powers in excess of ± 40.00 D are possible
• Lid sensation is minimal and foreign bodies under lenses are rare
• Since the introduction of gas permeable material for scleral lenses, the fitting processes have become straightforward and predictable, so many more people can successfully use them