The first circle lenses that were released around 2005 were 14.0mm in diameter. If you have never tried circle lenses, we think that it is good to start out with 14.0mm or 14.2mm diameter. 14.0mm is sufficient enlargement for most people. Others won't realise that you are wearing cosmetic enhancement lenses unless they get within 0.5 m of you and stare into your eyes.
14.5mm provides a dolly effect. Others will know that you are wearing cosmetic lenses.
14.8mm+ provides a very large-eyed anime look. We would recommend this for special events or costume purposes. It will be very obvious that you are wearing cosmetic lenses.
Research confirms that the thicker the lens, the more stable the water content and the less dehydration your eye will suffer.
While lenses with higher water content have been shown to be subjectively more comfortable and can be worn for extended periods of time, they are more prone to dryness. Contact lenses with a low water content dehydrate less on the eye than do lenses with a high water content.