UV radiation affects the human body due to the fact that it might penetrate through the skin and damage biological cells. In the present study, density functional theory (DFT) within the Perdew-Burke-Ernzerhof (PBE) approximations (GGA-PBE) is used to examine certain structural, optical, electronic, and physical characteristics exhibited by the beryllium-based cubic perovskite ZBeF3 (Z = Na, Rb, Cs) compounds. The substances ZBeF3 (Z = Cs, Na, Rb) exhibit space group 221-pm3m, with (4.07, 3.61, and 3.89) Å lattice factors and (67.76, 47.33, and 58.88) Å3 volumes that correspond to their structural features. Simulated findings show that the ZBeF3 (Z = Cs, Na, Rb) exhibit indirect bandgaps of 5.19, 6.12, and 6.61 eV, respectively. All compounds appear to be insulators based on their band structure features. Optical characteristics of compounds such as conductivity, absorption, and reflectivity that represent the interaction between light and matter are investigated. These materials appeared to be robust but brittle, as demonstrated by their greater bulk modulus B with respect to elastic properties, Pugh's ratio, and B/G ratios, in addition to Vickers hardness. According to research, the compound ZBeF3 can be applied to cars, sunglasses, and room windows to serve as UV protection and a reflecting layer.