The spectral and baric dependences of the birefringence Δn_{i} of K_{2}ZnCl_{4} crystals were studied. It is shown that the dispersion Δn_{i}(λ) is normal and sharply increases on approaching the absorption edge. It is established that the uniaxial pressures do not change the character but only the values of the dispersions dΔn_{i}/dλ and temperature dependences of dΔn_{i}/dT.
The effect of uniaxial pressure (σ_m ≤ 200 bar) on the spectral (300-800 nm) and temperature (77-300 K) dependences of the refractive indices of Rb_{2}ZnCl_{4} crystals are investigated. The baric dependences of the electron polarizability, specific refraction and the parameters involved in the Sellmeier formula are calculated.
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