Your tears have an oil layer and it thinned

Dry eyes

5 min read

You started blinking harder at the screen and could not work out why. Nobody tells you that the tear film has a lipid layer on top, produced by small glands behind the eyelids called meibomian glands. Those glands carry androgen receptors, and when androgen levels decline through the menopausal transition, lipid production can decrease. A thinner oil layer means the tear film evaporates faster.

You are not imagining the dryness, the grit, or the sting. The glands that produce the protective layer of the tear film carry receptors for the same hormones that shifted, and the research has traced the connection through those receptors.

The TFOS DEWS II report, a comprehensive international review published in The Ocular Surface in 2017, found that sex, gender, and hormones play a major role in the regulation of ocular surface tissues and in the difference in dry eye prevalence between women and men. The report noted that hormones are an important factor in dry eye, but not the sole cause. Screen use, medications, autoimmune conditions, and environmental factors all contribute.

The mechanism with the strongest support runs through androgens, not estrogen. A 2025 review in Frontiers in Endocrinology detailed that meibomian glands contain androgen receptors and that androgens promote the synthesis and secretion of meibum, inhibit keratinization of duct epithelium, and downregulate pro-inflammatory factors. When androgen levels decline progressively through the menopausal transition, those protective effects diminish. A separate finding from the Women’s Health Study adds weight to this: in 25,665 postmenopausal women, estrogen-only HRT was associated with a 69 percent higher risk of dry eye compared with no HRT, while estrogen plus progesterone was associated with a 29 percent higher risk. The fact that adding estrogen increased rather than decreased dry eye risk is consistent with the androgen pathway.

What it does not establish

The TFOS DEWS II report states that hormones are an important factor but not the sole cause. No study has isolated the hormonal component from screen use, medications, environment, and other contributors in any individual woman. The androgen pathway is plausible and well-supported in population data, but causation in any one person cannot be determined. The Women’s Health Study was observational and cannot prove that estrogen caused the increased dry eye risk.

The meibomian gland and the oil layer

The meibomian glands sit behind the eyelids and produce the lipid layer of the tear film. This layer reduces evaporation and stabilizes the tear surface. When the glands become obstructed or their output decreases, the condition is called meibomian gland dysfunction. MGD is recognized as the leading cause of evaporative dry eye. The TFOS DEWS II report describes the tear film as a two-layered structure: a mucoaqueous layer and a lipid layer on top.

The numbers

69%

Higher risk of dry eye in postmenopausal women using estrogen-only HRT compared with no HRT, in the Women’s Health Study of 25,665 women. Estrogen plus progesterone carried a 29% higher risk. The finding that estrogen increased risk is consistent with the androgen pathway.

29%

Pooled prevalence of meibomian gland dysfunction in the general population. The prevalence increased with age independent of sex, but MGD-related evaporative dry eye is the most common form of dry eye seen in clinical practice.

Two numbers that point in the same direction: the glands behind the eyelids lose function with age, the hormonal environment of the menopausal transition accelerates that loss through a specific receptor pathway, and adding estrogen alone does not help. The oil layer thinned. What you feel is the tear film losing its lid.

The intervention with the strongest evidence

Warm compress therapy

Supported by clinical evidence review

A 2024 evidence review in Ophthalmology and Therapy examined 20 years of clinical studies on warm compresses for meibomian gland dysfunction. It found that a single application of 5 to 20 minutes can significantly improve tear quality, and that repeated applications significantly relieve dry eye symptoms and, in most studies, significantly improve meibomian gland health. The review noted that moist heat retains warmth better than dry heat and may have superior therapeutic effects.

“A single application of warm compress, ranging from 5 to 20 minutes, can significantly improve tear quality, while repeated applications significantly relieve symptoms associated with dry eyes from MGD.”

Lee et al., Ophthalmology and Therapy, 2024

What it is not

A cure for meibomian gland dysfunction or a way to reverse androgen decline. Warm compresses are palliative: they soften the lipid in the glands and help it flow, which stabilizes the tear film temporarily. If symptoms persist or worsen despite consistent use, the AAO Preferred Practice Pattern recommends evaluation by an ophthalmologist.

When to call

If dry eye symptoms persist or worsen despite warm compresses and artificial tears after four to twelve weeks. The AAO recommends ophthalmology evaluation at that point to determine underlying cause and consider prescription options.

If dry eyes are accompanied by dry mouth, joint pain, or persistent fatigue. This pattern can indicate an autoimmune condition such as Sjögren syndrome, which requires separate evaluation.

If you notice sudden redness, pain, or a change in vision alongside the dryness. These are not typical of evaporative dry eye and warrant prompt assessment.

This week

Warm a clean, damp cloth until it holds comfortable heat. Close your eyes and hold it gently over both lids for ten minutes, once a day. The warmth softens the lipid in the meibomian glands and helps it flow onto the tear film.

After the compress, gently press along the lower eyelid from the inner corner to the outer with a clean fingertip. This helps express the softened lipid from the gland openings.

If you use artificial tears, choose preservative-free drops. Preserved drops can irritate the ocular surface if used more than four times a day, which works against the lubrication you are trying to add.

The dryness that settled into your eyes is not screen fatigue and not a complaint about nothing. The glands that make the oil layer of the tear film carry receptors for the same hormones that declined, and when the signal dropped, the oil layer thinned. A warm damp cloth over closed eyes, ten minutes a day, is the first step the evidence supports.

One tap, no form

What do your eyes feel like by evening?

Each option opens a short prepared reply. Nothing you tap is public. What most readers tap shapes what gets explained next.

Gritty and dry, worse after screens

They water constantly but still feel dry

Stinging that started in the past year

None of these, but something changed

Or write in your own words. Every reply is read.

Read recent issues

Every source read for this issue

One international expert report, one hormonal mechanism review, one midlife prevalence study, one warm compress evidence review, one clinical practice guideline, and one large cohort study.

1	TFOS DEWS II Sex, Gender, and Hormones Report International expert report, The Ocular Surface, 2017

2	Focus on sex hormone axis disorder: exploring the susceptibility mechanism of dry eye in perimenopausal women Review, Frontiers in Endocrinology, 2025

3	Dry eye symptoms in midlife women: a cross-sectional analysis Cross-sectional study, 2025

4	Evidence-Based Strategies for Warm Compress Therapy in Meibomian Gland Dysfunction Evidence review, Ophthalmology and Therapy, 2024

5	Dry Eye Syndrome Preferred Practice Pattern Clinical practice guideline, AAO, 2023

6	Hormone Replacement Therapy and Dry Eye Syndrome Cohort study, JAMA, 2001

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