In a well-made prosthetic eye, tears should flow evenly
across the prosthesis just as they do over the natural eye — in a sheet-like
fashion, rather than collecting in droplets. We call this type of behavior
hydrophilic — “water loving.” Hydrophobic (“water fearing”) artificial
eyes repel water, much like the surface of a waxed car.
The difference between a hydrophilic and a hydrophobic piece can
have dramatic differences in the satisfaction for the patient. Hydrophobic
pieces can lead to feelings of dryness and discomfort, excess mucus
secretion, blistering and giant papillary conjunctivitis (GPC). It’s important
to note that some of these problems may arise from the patient’s own
biology. But often, they arise because of problems that the ocularist
creates. The waxes used to polish pieces are sometimes not cleaned off
properly and the patient’s prosthesis repels tears.
Image courtesy: John Stolpe, BCO
Actual Patient with Hydrophobic Surface
Actual Patient with Hydrophilic Digital Artificial Eyes
Closeup of the Same Digitally 3D Artificial Eyes