Print slow and make sure you have no underextrusion. Also print on the warm side (but not so warm that the material starts to produce too much gasses). So that the extruded sausages can flow well into the corners of existing layers.
I would suggest you do little test cubes of 15 x 15 x 15mm, and adjust temperature, speed and flow settings on the fly, to see the effect.
But it will never be very good, in my experience. The best I could get with PET (never tried transparent PLA), was some sort of "frosted glass" look. It is good enough to let a light shine through, or a logo embedded in the model. But not for a lens...
These are transparent PET (text voids totally enclosed by the model):
does it help to look at filling.
pattern like triangle etc.
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