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Description
when import actor, it use daz iray thin wall eyemat to blender, these strange thing often happen. even though you modify eye mat for cycles shader, it change eye color more dark, and pupil size large with ior. If you just use perfect transparent. it not offer good env reflection with your light), you can compare with my next render. good eye.

Because iray thin wall can keep refleciton with ior 1.3 or 1.4 for water, tear,, etc.. but refraction no bend (it is virtual thin wall) then character can clear show pupil and screla materials which covered thin mat (eye mositure, cornea etc)

Then if you change ior to 1.01 or 1.00 etc,, it can transmit eye no bend. or you may mix transparent shader.
But it reduce good reflection. Yes there is no water or human eye mositure which have 1.01 or 1.00 ior.
the ior value actually change not only about transmisison, but reminder (reflection) too.

Then I have tried many things,, sometimes I actually add thickness for eye, (it is usually recommended way,
or it is reasonable way to add real thickness for glass etc,, with modelling by nvidia iray documents. to get correct reflection
and reasonable refraciton for thin material.

But it need to modify actualll geometry, and daz eye is not so simple, it covered really close each material.then
it can easy overwrap etc.. and most bad thing is, once add geometry or separate it, I can not import morph any more.

it is clucial for me. So I took long time, to learn cycles shader nodes,, and tried to modify shader . then finally I made custom cycles glass shader, which can mimic iray thin wall mat (iray water shader with thin wall on) .
If someone have already felt samething, to convert iray thin mat for cycles, compare please, next "goodeye" render pic.

Description
when import actor, it use daz iray thin wall eyemat to blender, these strange thing often happen. even though you modify eye mat for cycles shader, it change eye color more dark, and pupil size large with ior. If you just use perfect transparent. it not offer good env reflection with your light), you can compare with my next render. good eye.

Because iray thin wall can keep refleciton with ior 1.3 or 1.4 for water, tear,, etc.. but refraction no bend (it is virtual thin wall) then character can clear show pupil and screla materials which covered thin mat (eye mositure, cornea etc)

Then if you change ior to 1.01 or 1.00 etc,, it can transmit eye no bend. or you may mix transparent shader.
But it reduce good reflection. Yes there is no water or human eye mositure which have 1.01 or 1.00 ior.
the ior value actually change not only about transmisison, but reminder (reflection) too.

Then I have tried many things,, sometimes I actually add thickness for eye, (it is usually recommended way,
or it is reasonable way to add real thickness for glass etc,, with modelling by nvidia iray documents. to get correct reflection
and reasonable refraciton for thin material.

But it need to modify actualll geometry, and daz eye is not so simple, it covered really close each material.then
it can easy overwrap etc.. and most bad thing is, once add geometry or separate it, I can not import morph any more.

it is clucial for me. So I took long time, to learn cycles shader nodes,, and tried to modify shader . then finally I made custom cycles glass shader, which can mimic iray thin wall mat (iray water shader with thin wall on) .
If someone have already felt samething, to convert iray thin mat for cycles, compare please, next "goodeye" render pic.