1985

[1] Guillon M, Bilton S, Bleshoy H, Guillon JP, Lydon DP. Limbal changes associated with hydrogelcontact lens wear. Journal of the British Contact Lens Association. 1985;8:15-9.
[2] Holden BA, Sweeney DF, Vannas A, Nilsson KT, Efron N. Effects of long-term extended contact lens wear on the human cornea. Invest Ophthalmol Vis Sci. 1985;26:1489 – 501.

Links to abstracts
[1] http://www.sciencedirect.com/science/article/pii/S0141703785800021
[2] http://www.ncbi.nlm.nih.gov/pubmed/3863808?dopt=Citation