"Geo crazy SFW05 halloween circle lenses" are also known as white lizard eye lenses. The design features white iris with a black slit. The pupil is transparent to let you see through. The good thing is pupil is not awkwardly big in size; so it covers your eyes quite successfully.
The enlargement is not too obvious since the purpose of geo crazy lenses is to mask your original eye color. Read Geo SFW05 crazy lens review by njeniffer and get inspired with her damn scary halloween looks; she has created using GEO crazy circle lenses