The phrase "a split face" is correct and usable in written English.
It can be used to describe a face that is divided or has contrasting features, often in a metaphorical or artistic context.
Example: "The painting depicted a split face, one half serene and the other filled with anguish, capturing the duality of human emotion."
Alternatives: "divided face" or "fractured face".
Thousands of posters decorate the capital's gray blast walls, including one that shows a split face -- half Saddam Hussein, half Ayad Allawi -- in a blunt effort to smear Mr. Allawi, a former prime minister, and his secular coalition.
In a split face mode, severe NLFs of 87 subjects were treated, one side with Juvéderm™ Ultra Plus and the other side with Zyplast®.
LED effects were then assessed in aged/photoaged individuals in a split-face single-blinded study.
A small number of studies used a split-face cross-over design.
24 Kessler et al compared 30% GA versus 30% salicylic acid (SA) peels in 20 patients with mild to moderate acne, using a split-face design.
The RCT of Kessler et al 42 examined the effectiveness of both a 30% glycolic acid peel and a 30% salicylic acid peel in 20 patients every 2 weeks for 6 treatments, with a split-face application.
Ilknur et al 43 also showed an equal effectiveness in the reduction of acne lesions with glycolic and amino fruit acid peels given every 2 weeks for 6 months in a split-face study with 24 patients.
Simmonds et al performed a split-face, double blind investigator study with 16 patients applying 1% 5-fluorouracil cream to one side of their face and 5% cream to the other side of the face.
In a split-face study, there was no significant difference in efficacy between ALA-PDT plus red light (34 J/cm) and MAL-PDT plus red light (34 J/cm) with 3-hour incubation times.
Prager et al, in a split-face study, showed that in fact 4 weeks after the injection of HA soft tissue filler into nasolabial folds, a monophasic gel presented a more desirably even clinical result than a biphasic gel.
Although beyond the scope of the current investigation, this would be most efficiently evaluated using a split-face model with quantitative camera imaging to assess degree and maintenance of correction.
