The invention mainly relates to a polymeric composition based on a polyamide comprising: a) 50 to 98% by weight of a transparent amorphous polyamide; b) 1 to 15% by weight of a polymer in the form of core-shell particles; and c) 1 to 15% by weight of a copolymer comprising polyether blocks and polyamide blocks, characterized in that said copolymer comprising polyether blocks and polyamide blocks has: - in a 2 mm layer, a transmittance at 560 nm of 90% or more, and - a refractive index which does not differ by more than 0.01 from that of the transparent amorphous polyamide, and in that the polymer in the form of core-shell particles has a refractive index which does not differ by more than 0.01 from that of the transparent amorphous polyamide. The invention also relates to a process for producing said composition, and to the composition that can be obtained by means of said process. Finally, it relates to the use of said composition for the production of transparent articles by injection moulding, and also to such articles.