What is claimed is:
1. An ophthalmic composition consisting essentially of carrier particles comprising a carrier component and one or more kinds of active substance(s) for ophthalmic therapy dispersed or dissolved in the carrier component, wherein the specific gravity of said carrier particles is adjusted to not less than 1.2.
2. The ophthalmic composition according to claim 1, wherein the specific gravity of said carrier particles is adjusted by a specific gravity modifier.
3. The ophthalmic composition according to claim 1 or 2, wherein said carrier component is a high molecular carrier.
4. The ophthalmic composition according to claim 1 or 2, wherein said carrier component is a fatty carrier.
5. The ophthalmic composition according to any one of claims 1 to 4, wherein the particle size of said carrier particles is not larger than 75 m.
6. A ophthalmic solution containing the ophthalmic composition according to any one of claims 1 to 5 which is suspended in a dispersion medium.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A power dimmer for an A.C. load comprising, between two terminals, two one-way switches connected in anti-parallel and controllable to the off and on states, each switch being controlled by a driver circuit setting the turn-off times of each of the switches with respect to a reference value, wherein each driver circuit is associated with a supply circuit comprising:
a voltage storage element;
a diode in series with said storage element;
a voltage-limiting element in parallel with the serial connection of said storage element and said diode, the two supply circuits being connected to each other by a capacitor and the respective supply voltages of the driver circuits being provided across the respective capacitors of each supply circuit.
2. The dimmer of claim 1, wherein the respective voltage-limiting elements set the supply voltages of the driver circuits.
3. The dimmer of claim 1, wherein a resistor is interposed in series with the capacitor between the two supply circuits.
4. The dimmer of claim 1, wherein the power reference is communicated from a driver circuit to another by an optocoupler.
5. The dimmer of claim 1, wherein the power reference is set by a potentiometer with isolated double tracks, shared by the two driver circuits.
6. The dimmer of claim 1, wherein the voltage-limiting elements are zener diodes.
7. The dimmer of claim 1, wherein the diodes only conduct during respective half-cycles of an A.C. signal.
8. The dimmer of claim 1, wherein the voltage storage elements are capacitors.