This led to varying refractive index throughout the glass, and light waves passing through lenses made of this glass were bent erratically.
(This; led; to varying refractive index throughout the glass) (light waves; passing; through lenses) (lenses; made; of this glass) (light waves passing through lenses; were erratically; bent)
This light waves lenses light waves passing through lenses
led passing made were erratically
to varying refractive index throughout the glass
through lenses
of this glass
bent