User's Manual

Assembly and Maintenance

Cut a length of tubing about 15 cm (6 inch) long. Adjust the

syringe so that the piston is beyond the midpoint of the cylinder.

Attach the piece of plastic tubing to the 10 mL syringe and the

connector on the edge of the lens housing (see Figure 1).

NOTE: Avoid touching the surface of the flexible membranes. If

you need to clean the membrane’s surface, use a soft, lint-free

cloth moistened with water.

To remove a membrane for cleaning, carefully remove the

retainer ring that holds the membrane in place and lift the mem-

brane off the lens housing holding just the edges of the mem-

brane (see Figure 2).

Put the clean membrane on the edge of the lens housing so that

some of the membrane material extends over the edge. Be sure

to center the membrane on the lens housing. Carefully press the

retainer ring over the membrane and onto the lens housing

(see Figure 2).

Filling the Lens

Fill the lens housing with a fluid such as water (or corn syrup)

before using it with the Human Eye Model or the Basic Optics

components. To fill the lens housing with a fluid, use differences

in pressure to allow the fluid to fill the lens. Start with the lens

housing and syringe connected to the plastic turing as in

Figure 1.

• Disconnect the syringe from the plastic tubing.

• To fill the syringe, push the piston all the way into the cylin-

der. Put the end of the syringe into the fluid and slowly pull the piston outward so that the fluid is forced up into the cylinder.

Stop when the fluid level is at the midpoint of the cylinder.

• Re-attach the plastic tubing to the syringe. Hold the syringe vertically so the lens holder hangs down from the end of the tub-

ing.

• DO NOT force the liquid from the syringe into the lens holder. Instead, slowly pull the piston out so that air from inside the

lens holder bubbles up through the liquid in the cylinder. The fluid should begin moving drop-by-drop into the lens.

• When the piston is almost to the end of the cylinder, start pushing it back into the cylinder so that fluid moves from the cylin-

der into the lens housing.

• Repeat the process until the lens holder is filled with fluid and there are no air bubbles in the lens.

• After the lens holder is filled, make sure that the tubing is also filled with fluid. Refill the syringe until it is about one-quarter

full and reconnect it to the syringe.

Syringe

Tubing

Lens Housing

Connector

Figure 1

Membrane

Figure 2

Retainer ring

Membrane

Lens Housing