Prosthetic eye

Artificial Eye
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Prosthetic eyes

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COMPARISON OF EYE PROTHESES SPECIAL-GLASS
VERSUS SYNTHETIC

Special Glass

Advantage: Disadvantage:
smoother surface because fire polished breakable
Better compatible due to consistence with non organic material a little cooler than the artivificial eye
good wetting, the tear fluid builds a regular film onto the glass surface.  

Synthetic

Advantage: Disadvantage:
In principal, more durable Less smooth surface due to mechanical polishing
good thermal characteristic especially in winter time Synthetic is less tolerable and may cause allergic reactions
  Cannot be wetted because fluid does not flow evenly and naturally on the synthetic surface

The artificial eye from special glass is made by the oculist with the presence of the patient in a single session

For the fitting of a synthetic eye the patient has to visit the oculist at least 2 times with at least 2 weeks between visits.

WETTING OF THE SURFACE of a glass eye and synthetic eye with a fluorescent liquid

Special Glass   Synthetic
glass eye Each prosthesis is wetted with a drop of liquid and you can see the different results. synthetic eye
The fluid flows naturally over the glass surface.   A drop of fluid takes shape on the synthetic surface.
glass eye Different tensions on the surface between the fluid and the used material are causing this phenomenon. synthetic eye
In case of the prosthetic eye from special glass, the tear fluid acts as a thin film between prosthesis and tissue prohibiting any friction.   In case of the synthetic eye may result in a discontinuous flow of the tear fluid over the prosthesis and may cause irritations and inflammation.

*) lt. Dr. M. Härting

Glass Eye not used

Glass Eye not used:

The fire polished surface is extremely smooth and fine The magnification of this image is 25 times higher compared to the other images

Synthetic Eye not used

Synthetic Eye not used:

In addition to the defects on the surface you see parallel running scratch trails which are characteristic for synthetic eyes. The are created during the mechanical polish, the last stage of the manufacturing process.

Glass Eye: used 1 year

You can see various scratch trails running across the surface. They are not very deep compared to the synthetic eye at the right.

Synthetic Eye used 1 year

Synthetic Eye: used 1 year

You can see numerous, up to 150µ wide defects affecting the structure.