In this blog, we’ll explore:
• How hormones affect vision during childhood
• Vision changes in women are linked to the menstrual cycle, pregnancy, and menopause
• The impact of thyroid hormones on the eye
• What you can do if you suspect hormones are affecting your vision
• When to seek professional advice

Hormones & Children’s Vision

Hormonal systems begin to develop early in life, and growth phases in children and adolescents can lead to shifts in vision. Key points include:

• Puberty & Growth Spurts: During puberty, levels of growth hormone, sex hormone (oestrogen, testosterone) and other endocrine changes surge. These can subtly affect the shape of the eyeball, cornea curvature, and the way the eye focuses. As a result, children and teenagers may experience changes in their prescriptions.
• Myopia Progression: Many children experience worsening of their myopia during the school years. While not strictly hormonal, rapid body growth and eye elongation are linked with systemic growth signals.
• Accommodative Changes: Hormones can influence the muscles that control focusing (accommodation). During periods of rapid hormonal fluctuation, some children may temporarily find near/far focusing more tiring or a bit unstable.
• Dryness or Ocular Surface Changes: While less common in younger years, hormonal fluctuation can affect tear quality. In rare cases of endocrine or systemic disease in childhood (like juvenile thyroid disease), ocular symptoms may emerge earlier.

If your child reports blurry or fluctuating vision, eye fatigue or discomfort, it’s important to have their eyes checked regularly, especially during key growth stages.

Women & Hormonal Vision Changes

Women’s vision often fluctuates during menstrual cycles, pregnancy, and particularly around menopause.

Menstrual Cycle

• Some women notice slight visual fluctuations or blur just before or during their cycle. Changes in fluid retention, corneal thickness, or tear film stability may underlie this effect.
• Contact lens wearers sometimes report discomfort or dryness during specific parts of the cycle due to changes in tear chemistry or surface alterations.

Pregnancy

Pregnancy is a period of profound hormonal shifts and fluid retention. Effects on vision may include:

• Corneal Swelling/Thickening: Increased hydration and changes in corneal curvature can induce temporary refractive shifts (blurring, mild astigmatism).
• Dry Eye Changes: Tear film instability or changes in tear composition can cause irritation, a gritty feeling, or fluctuation in clarity.
• Transient Changes in Intraocular Pressure: Some pregnant patients may see small fluctuations in eye pressure.

Usually, these changes resolve after childbirth or when hormone levels stabilise.

Menopause

This is a time when the drop in oestrogen and other sex hormones brings more sustained changes.

• Hormonal Dry Eye: Reduced oestrogen and androgen levels often impair the tear film layers (especially the oil layer from meibomian glands), leading to increased evaporation, dryness, burning, a gritty sensation, fluctuating blur, or light sensitivity. Our complete guide to dry eye covers the causes and treatment options, including IPL therapy, in full.
• Changes in Corneal Shape/Thickness: Hormonal fluctuations may lead to subtle changes in corneal elasticity or thickness, causing existing glasses or contact lenses to feel ‘off’
• Increased Risk of Eye Conditions: Lower oestrogen exposure is associated with increased prevalence of glaucoma, cataracts, and potentially earlier onset of lens changes.
• Blepharitis & Eyelid Changes: Hormonal shifts can disrupt the function of the eyelid oil glands, leading to inflammation or blepharitis.
• Light Sensitivity & Visual Fluctuation: Some women report changes in light tolerance or subtle shifts in clarity during menopause.

Because 86% of women are reportedly unaware of the link between menopause and eye health, many simply attribute symptoms to ageing or dry eye.

Thyroid Hormones & Vision

The thyroid gland is another hormonal system with notable eye impacts. Disorders like hyperthyroidism or hypothyroidism, and specifically Graves’ Disease, carry ocular symptoms.

• Thyroid Eye Disease (TED): In Graves’ disease, inflammation behind the eye can cause the eyeball to protrude forward (proptosis), leading to double vision (diplopia), increased exposure of the cornea and eyelids, and discomfort, swelling, and vision disturbances.
• Swelling / Oedema: Hormonal imbalances can cause swelling of tissues (including eyelids or orbit), which may alter vision or ocular comfort.
• Changes in Intraocular Pressure: Certain types of thyroid dysfunction are associated with altered eye pressure or vascular changes that affect retinal health.
• Dry Eye & Surface Irritation: As with many hormonal shifts, changes in the tear film may accompany thyroid disease and exacerbate dryness or irritation.

If you have a known thyroid condition and are experiencing new symptoms affecting your vision or eye comfort, you should mention this at your eye examinations so your optometrist can monitor the situation more closely or coordinate with endocrinologists.

When to Worry & Seek Specialist Referral

Most hormone-linked changes are manageable. But certain signs signal an urgent exam:

• Suddenly, significant vision loss or distortion
• New onset of double vision, shadows, or blind spots
• Persistent eye pain, redness, or swelling
• Symptoms of thyroid eye disease (bulging eyes, inability to close eyelids fully)
• Sudden onset of dryness unresponsive to standard treatment

These may represent retinal issues, glaucoma, thyroid optic neuropathy, or other ocular pathology necessitating ophthalmologist involvement.

Hormones play a surprisingly significant role in your vision throughout life, from childhood growth spurts to the fluctuations of menstrual cycles, pregnancy, menopause, and thyroid health. While many changes are temporary or manageable, they deserve attention and the right care. By being alert to symptoms, tracking changes, and visiting your optometrist when needed, you can stay ahead of problems and maintain clear, comfortable vision through hormonal transitions.

Suppose you’ve noticed blurred vision, dryness, fluctuating clarity, or discomfort coinciding with hormonal changes. In that case, our friendly team at D. I. Blow Opticians is ready to help you understand what’s happening and guide you to the best solutions. Book your eye test today and let us support your vision, no matter what stage of life you’re in.

FAQs

Can Hormones Affect Your Eyesight?

Yes. Hormonal changes, from puberty and the menstrual cycle to pregnancy, menopause, and thyroid conditions, can all affect vision, most commonly through changes in tear film stability (leading to dryness or fluctuating blur) and, less often, temporary shifts in corneal shape or eye pressure. Most of these changes are manageable, but persistent or sudden symptoms are worth having checked.

Can Your Period Affect Your Eyesight?

Some women notice mild visual fluctuation, blur, or contact lens discomfort around their menstrual cycle, usually linked to changes in fluid retention or tear film stability. This tends to be temporary and resolves as hormone levels shift again later in the cycle.

Can Tired Eyes and Eye Strain Be Linked to Hormonal Health?

Yes, hormonal changes, particularly reduced oestrogen during menopause, can affect the oil layer of your tear film, making eyes more prone to dryness, tired eyes, and eye strain. If tiredness is persistent, it’s worth ruling out other causes like screen use or an outdated prescription at an eye test.

Do Hormonal Changes Affect Your Vision During Pregnancy?

Yes, pregnancy hormones can cause temporary corneal swelling, dry eye, and small fluctuations in eye pressure, which is why opticians generally advise against changing your glasses prescription until a few months after birth, once hormone levels have settled.

The post How Hormonal Changes Can Affect Your Vision appeared first on D.I.Blow Opticians.

What Is A Cataract?

A cataract is a clouding of the lens in the eye that affects vision. According to the NHS, most cataracts are related to ageing, and they’re very common in older people.

A cataract can occur in either or both eyes. It cannot spread from one eye to the other.

There are many different types of cataracts. Not all cataracts cause symptoms. If a cataract causes no symptoms, it can usually be left alone. If symptoms, such as blurred vision, occur then cataracts can be treated very successfully with surgery.

The Lens

The lens is a clear part of the eye that helps to focus light, or an image, on the retina. The retina is the light-sensitive tissue at the back of the eye.

In a normal eye, light passes through the transparent lens to the retina. Once it reaches the retina, light is changed into nerve signals that are sent to the brain. The lens must be clear for the retina to receive a sharp image. If the lens is cloudy from a cataract, the image you see will be blurred.

What Causes Cataracts?

The lens lies behind the iris and pupil. It works much like a camera lens. It focuses light onto the retina at the back of the eye where an image is recorded. The lens also adjusts the eye’s focus, letting us see things clearly both up close and far away. The lens is made of mostly water and protein. The protein is arranged in a precise way that keeps the lens clear and lets light pass through it.

But as we age, some of the protein may clump together and start to cloud a small area of the lens. This is a cataract. Over time, the cataract may grow larger and cloud more of the lens, making it harder to see.

As you become older, you might also find that the lens begins to acquire a brownish shade. If you have advanced lens discolouration, you may not be able to identify blues and purples.

Cataracts are associated with the sun and so are far more common in areas of the world such as India and Africa. Other causes include injury, diabetes, smoking, certain drugs, and some ocular diseases.

Whilst cataracts are commonest in older people, they can occur at any age. Some children are born with cataracts, this is known as congenital cataracts.

Cataract Symptoms

The most common cataract symptoms are:
• Cloudy or blurry vision
• Colours seeming to fade
• Glare, headlights, lamps, or sunlight might appear too bright. A halo may appear around lights
• Poor night vision
• Double vision or multiple images in one eye.
• Frequent prescription changes

Because cataracts normally develop very slowly over many years, most people don’t notice the gradual deterioration in their vision until it starts to interfere with their daily activity, or it is spotted by their optometrist.

Different Types of Cataracts

• Secondary Cataract: Cataracts can form after surgery for other eye problems, such as glaucoma. Cataracts also can develop in people who have other health problems, such as diabetes. Cataracts are sometimes linked to steroid use.
• Traumatic Cataract: Cataracts can develop after an eye injury, sometimes years later.
• Congenital Cataract: Some babies are born with cataracts or develop them in childhood, often in both eyes. These cataracts may be so small that they do not affect vision. If they do, the lenses may need to be removed.
• Radiation Cataract: Cataracts can develop after exposure to some types of radiation.

How Is A Cataract Detected?

Cataracts are detected through a comprehensive eye exam that includes:
• Visual Acuity Test: This eye chart test measures how well you can see at various distances.
• Dilated Eye Exam: Drops are placed in your eyes to widen, or dilate, the pupils. Your optometrist uses a special magnifying lens to examine your retina and optic nerve for signs of damage and other eye problems.
• Tonometry: An instrument measures the pressure inside the eye.

How Are Cataracts Treated?

The most effective treatment for cataracts is an operation to remove the cataract and replace the cloudy lens with a clear artificial implant.

The lens of each eye should be clear in order for your eyes to work properly. When glasses no longer improve your vision, the only way to restore your vision is by having the cataract removed by surgery.

The Cataract Operation

Cataract surgery is one of the most common and quickest surgeries performed today. Modern cataract surgery, called phacoemulsification, is usually performed under local anaesthetic as a day case procedure. During the surgery, a tiny incision is made into the eye and the lens removed with an ultra-sound probe. The capsule of the lens is left behind and this is used to house the new lens implant. The whole procedure takes between 15 and 20 minutes and the visual recovery is very quick with most patients noticing improved vision within a matter of days.

Lens Implant Types

Each patient and each eye are different. Measurements are taken prior to surgery, called biometry, to establish the correct lens power for the individual eye. Lens implants also come in different types. The two major categories of lens implants are:

Monofocal Lenses

The vast majority of patients have this lens type put in. These provide good distance vision, but glasses are required for close work.

Multifocal Lenses

These lenses offer a high probability of achieving glasses independence, providing patients the ability to see far as well as to read without glasses.

However, patients can experience a reduction in contrast sensitivity, especially in dim lighting, as well as halos and glare around lights at night.

The pre-operative preparations for patients interested in multifocal lens implants are more involved than when monofocal lenses are being used, a wider range of issues need to be discussed, and the post-operative management is more intensive. These are the major reasons that these lenses are not offered on the NHS.

Current Cataract Research

The National Eye Institute is conducting and supporting a number of studies focusing on factors associated with the development of age-related cataracts.

These studies include:

• The effect of sunlight exposure, which may be associated with an increased risk of cataracts.
• Vitamin supplements, which have shown varying results in delaying the progressions of cataracts.
• Genetic studies, which show promise for better understanding cataract development.

For further support and information about living with cataracts, the RNIB is a good additional resource.

Cataracts aren’t the only age-related eye condition worth knowing about — our guide to Age-Related Macular Degeneration (AMD) covers another common one, including symptoms and treatment options.

For more on age-related eye conditions and how to manage them, see our full eye health guide. If you have any concerns about your vision, book an eye exam with your local D.I. Blow Opticians.

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