Table 3. pH, Viscosity, Particle Size, Conductivity, Zeta Potential, Refractive Index and PI of Selected Dexamethasone Microemulsions (Mean ± SD, n = 3) .

Formulation	pH	Viscosity, cps	Mean Particle Size, nm	Conductivity, ms/cm	Zeta Potential, mV	Refractive Index	Polydispersity Index
MED-1	7.10 ± 0.72	69 ± 1.08	11.3 ± 2.1	0.0881 ± 0.0021	-0.808	1.441 ± 0.41	0.363 ± 0.25
MED-2	7.04 ± 0.41	91 ± 1.05	16.3 ± 3.5	0.0810 ± 0.0015	-1.35	1.443 ± 0.53	0.358 ± 0.22
MED-3	7.15 ± 1.32	184 ± 0.61	14 ± 2.8	0.0864 ± 0.0025	-3.24	1.441 ± 1.64	0.363 ± 0.1
MED-4	7.22 ± 0.58	206 ± 1.24	159 ± 7.2	0.0668 ± 0.0017	-3.41	1.446 ± 1.12	0.366 ± 0.2
MED-5	6.41 ± 0.77	57 ± 0.74	7.16 ± 2.3	0.0852 ± 0.0022	-2.41	1.443 ± 1.86	0.363 ± 0.1
MED-6	6.56 ± 1.12	70 ± 0.44	9.37 ± 3.1	0.0693 ± 0.0004	-0.331	1.445 ± 0.82	0.353 ± 0.1
MED-7	6.73 ± 0.92	177 ± 0.57	6.41 ± 2	0.0706 ± 0.0002	-0.177	1.444 ± 0.49	0.363 ± 0.2
MED-8	7.10 ± 0.67	159 ± 0.83	5.09 ± 1.2	0.0893 ± 0.0014	-1.63	1.447 ± 1.25	0.363 ± 0.18