Lash science · The natural lash
Psychology and the perception of beauty
What lashes change in a face can be measured: how long people prefer them, how much bigger they make an eye look, what contrast does to age and health. What is not measured is why. This chapter keeps the two apart.
Length
How long lashes should look, according to raters
In the largest study, 319 adults rated one face shown with eleven lash lengths, from none at all to half the width of the eye. Every group of raters, on every version of the face, gave the same shape of answer: preference rose, peaked near a third of the eye's width, and fell.2
An earlier study found the same curve for women's faces and a shorter peak, about a fifth, for men's. A 2025 study found that rated health peaks at the same length as attractiveness.13
One line kept rising. Longer lashes were read as a sign of interest in casual relationships, well past the length that looked best. That is a stereotype in the raters, and it says nothing about the person wearing the lashes.3
The authors explain the preference as attraction to a signal of health that matches the length that best protects the eye. That is their framework. The ratings do not test it.2
At the atelier
This is the measured case for a natural length. Very long lashes did not look more attractive or healthier to raters; they looked less so. When we go dramatic, we do it with density and curl.
Looks, in the libraryThe shape of the results, redrawn. The faces were computer edited and rated online by adults in the United States.
The most admired lash is not the longest one.
In every group of raters, preference rose and then fell, peaking near a third of the eye's width.
Size
Dark lashes make an eye look bigger
Measured with a careful matching method, mascara and eyeliner made eyes look up to 6 percent wider, about 13 percent more area. Eye shadow alone added about 5 percent.4
The effects do not add up. With mascara on, eyeliner made no further difference. The researchers trace it to a known illusion: a ring drawn close around a circle makes the circle look larger.45
It is robust. The effect holds when the face is turned in any direction, and lower brows strengthen it.65
No lashes on either eye. The two openings are the same size.
Measured, the effect is up to 6 percent in width. Drawn here to show the illusion, not its size.
At the atelier
A well-defined lash line does most of the work. That is why a lighter set, placed with care, can open an eye as much as a heavier one.
Mapping, in the libraryContrast
Contrast reads as youth and health
Raising the contrast between the eyes and mouth and the rest of the face made women's faces more attractive and men's less so.7
Women's faces have more light-dark contrast between the eyes, lips and surrounding skin than men's, and adding contrast makes an androgynous face look female. Cosmetics raised facial contrast every time it was measured.89
Contrast fades with age. Measured on 289 women aged 20 to 70, it fell steadily, and when it was raised digitally, faces looked younger. The link held for French and Chinese raters alike.1011
Faces with more contrast were also judged healthier, both as they naturally were and when contrast was raised.12
At the atelier
Darkness and density can matter as much as length. For fine or light lashes, a dark, soft fibre adds contrast without adding weight.
Colour and finish, in the libraryLow contrast. In the studies, faces like this read as older.
The variable the contrast studies changed, drawn on one eye.
A glance
A quarter of a second is enough
Twenty-five women were photographed bare-faced and in three looks, natural, professional and glamorous. Shown for a quarter of a second, every look raised ratings of attractiveness, competence, likeability and trustworthiness, and more makeup raised attractiveness more.13
Given unlimited time to look, raters changed their minds on one trait. The glamorous look now lowered trust, while the natural look still raised it slightly.13
Other studies found makeup changed impressions of dominance and prestige differently for male and female raters, and that any makeup raised rated competence.1415
Gain in rated attractiveness at a quarter-second glance
Points on the study's rating scale, against no makeup. With a long look, the glamorous look lowered trust by 0.13.
Scale
Who you are matters far more
When everyday makeup was compared with the person wearing it, the makeup explained about 2 percent of attractiveness ratings and the person about 69 percent.1617
Professional makeup explained more, about a third, but the person still explained more. The faces that started out most attractive gained least.17
People also misjudge each other. Men and women wanted the same amount of makeup on a face, but both thought others wanted more, and the models' own makeup was far heavier than anyone preferred.18
At the atelier
We design for your face, not for a trend. Most clients want less than they think other people expect.
Share of attractiveness ratings explained
Two studies by the same research group. The professional figures are effect sizes, not exact shares.
Gaze
Where people look, and what else they read
The eye region sits at the centre of how faces are read. Studies of eye movements put the first glance near the centre of the nose and the best landing point just below the eyes. When people judge age and attractiveness, those judgements follow looks at the eye region most closely.19202122
Other eye cues are measured too. A dark ring around the iris made faces more attractive in one preliminary study. Reddened or yellowed whites made eyes look older and less healthy. Large eyes went with higher attractiveness ratings in a classic correlational study, and raters agree on who is attractive, within and across cultures.2324252627
Measured cues around the eye
- Lash length
- preferred near a third of the eye's width
- Eye size
- up to 6 percent larger with dark lashes or liner
- Contrast
- more reads younger and healthier
- The ring around the iris
- a dark ring read as more attractive, in one preliminary study
- The white of the eye
- redness and yellowing read as older and less healthy
The wearer
How it feels from the inside
Attractive people are judged and treated more favourably, even by those who know them, across many studies.27
Women in a small 1982 study said they felt more confident and sociable with their usual cosmetics. That was in imagined situations, with 42 people.29
A single study of 186 students found better test scores after putting on makeup than after listening to music. No replication was found, and a related idea, that clothing changes how people think, failed a direct replication of its best-known result.283130
At the atelier
If extensions make you feel more like yourself, that is reason enough. We just will not promise you more than the research does.
Often said
What the evidence shows
The first glance goes to the eyes.
The first fixation lands near the centre of the nose. The eye region is what judgements depend on most afterwards.2022
Longer lashes are always more attractive.
Ratings rise and then fall, peaking near a third of the eye's width.2
Makeup makes you smarter.
One study of 186 students. Not replicated.28
More makeup is what other people want.
People consistently overestimate how much makeup others prefer.18
At the atelier
What the research suggests for a set
A free 30-minute consultation comes first. We look at your natural lashes under magnification and design the set to your face.
- Length
- near a third of the eye's width
- Contrast
- darkness and density before length
- Amount
- less than you think others expect
Sources
Every numbered line above comes from one of these. Where a claim is still a hypothesis, the text says so.
- 1The effect of eyelash length on attractiveness: a previously uninvestigated indicator of beautyPazhoohi and Kingstone. Evolutionary Behavioral Sciences, 2022.Measured: 132 raters; read through the authors' later paper
- 2Eyelash length attractiveness across ethnicitiesPazhoohi and Kingstone. Scientific Reports, 2023.Measured: 319 raters, edited faces
- 3Long lashes, mixed signals: investigating the effect of eyelash length on perceived health, attractiveness, and sexual receptivityPazhoohi. Archives of Sexual Behavior, 2025.Ratings study
- 4Measurement of eye size illusion caused by eyeliner, mascara, and eye shadowMatsushita, Morikawa and Yamanami. Journal of Cosmetic Science, 2015.Measured: perception experiment
- 5A real-life illusion of assimilation in the human face: eye size illusion caused by eyebrows and eye shadowMorikawa, Matsushita, Tomita and Yamanami. Frontiers in Human Neuroscience, 2015.Measured: perception experiment
- 6Viewpoint invariance of eye size illusion caused by eyeshadowMuto, Ide, Tomita and Morikawa. Frontiers in Psychology, 2019.Measured: perception experiment
- 7Sex, beauty, and the relative luminance of facial featuresRussell. Perception, 2003.Measured: four experiments
- 8A sex difference in facial contrast and its exaggeration by cosmeticsRussell. Perception, 2009.Measured on photographs
- 9Cosmetics alter biologically-based factors of beauty: evidence from facial contrastJones, Russell and Ward. Evolutionary Psychology, 2015.Measured on photographs
- 10Aspects of facial contrast decrease with age and are cues for age perceptionPorcheron, Mauger and Russell. PLoS One, 2013.Measured: 289 women
- 11Facial contrast is a cross-cultural cue for perceiving agePorcheron, Mauger, Soppelsa, Liu, Ge, Pascalis, Russell and Morizot. Frontiers in Psychology, 2017.Measured: French and Chinese raters
- 12Facial contrast is a cue for perceiving health from the faceRussell, Porcheron, Sweda, Jones, Mauger and Morizot. Journal of Experimental Psychology: Human Perception and Performance, 2016.Measured
- 13Cosmetics as a feature of the extended human phenotypeEtcoff, Stock, Haley, Vickery and House. PLoS One, 2011.Measured: 25 women photographed, 268 raters
- 14Sex differences in the perceived dominance and prestige of women with and without cosmeticsMileva, Jones, Russell and Little. Perception, 2016.Measured
- 15Who's behind the makeup? The effects of varying levels of cosmetics application on perceptions of facial attractiveness, competence, and sociosexualityAguinaldo and Peissig. Frontiers in Psychology, 2021.Measured: 35 faces
- 16Facial cosmetics have little effect on attractiveness judgments compared with identityJones and Kramer. Perception, 2015.Measured
- 17Facial cosmetics and attractiveness: comparing the effect sizes of professionally-applied cosmetics and identityJones and Kramer. PLoS One, 2016.Measured: 33 creators and 45 models
- 18Miscalibrations in judgements of attractiveness with cosmeticsJones, Kramer and Ward. Quarterly Journal of Experimental Psychology, 2014.Measured
- 19Neural bases of eye and gaze processing: the core of social cognitionItier and Batty. Neuroscience and Biobehavioral Reviews, 2009.Review of the published research
- 20Two fixations suffice in face recognitionHsiao and Cottrell. Psychological Science, 2008.Measured: eye tracking
- 21Looking just below the eyes is optimal across face recognition tasksPeterson and Eckstein. Proceedings of the National Academy of Sciences, 2012.Measured: eye tracking and modelling
- 22Age and beauty are in the eye of the beholderKwart, Foulsham and Kingstone. Perception, 2012.Measured: eye tracking, 128 faces
- 23Preliminary evidence that the limbal ring influences facial attractivenessPeshek, Semmaknejad, Hoffman and Foley. Evolutionary Psychology, 2011.Preliminary, by the authors' own description
- 24Red, yellow, and super-white sclera: uniquely human cues for healthiness, attractiveness, and ageProvine, Cabrera and Nave-Blodgett. Human Nature, 2013.Measured
- 25Sclera color changes with age and is a cue for perceiving age, health, and beautyRussell, Sweda, Porcheron and Mauger. Psychology and Aging, 2014.Measured
- 26Measuring the physical in physical attractiveness: quasi-experiments on the sociobiology of female facial beautyCunningham. Journal of Personality and Social Psychology, 1986.Correlational study, 50 women
- 27Maxims or myths of beauty? A meta-analytic and theoretical reviewLanglois, Kalakanis, Rubenstein, Larson, Hallam and Smoot. Psychological Bulletin, 2000.Meta-analysis
- 28Does make-up make you feel smarter? The lipstick effect extended to academic achievementPalumbo, Fairfield, Mammarella and Di Domenico. Cogent Psychology, 2017.One study: 186 students
- 29Women's use of cosmetics: psychosocial correlates and consequencesCash and Cash. International Journal of Cosmetic Science, 1982.One small study: 42 women, imagined situations
- 30Evaluating the evidence for enclothed cognition: z-curve and meta-analysesHorton, Adam and Galinsky. Personality and Social Psychology Bulletin, 2025.Meta-analysis
- 31An old task in new clothes: a preregistered direct replication attempt of enclothed cognition effects on Stroop performanceBurns, Fox, Greenstein and Montgomery. PsyArXiv, 2019.Preregistered replication, preprint
Lash science
The natural lash
- Anatomy and the growth cycleRead
- Chemistry: keratin, bonds, pigmentRead
- Physics: length, curve, structure, loadRead
- Evolution and functionRead
- Psychology and the perception of beautyThis chapter
- Health: keeping and improving natural lashesRead