Myopia, Hyperopia and Astigmatism: Differences Explained Simply

They are the three most common refractive errors and yet many people don't know exactly what sets them apart. Does myopia mean poor near or far vision? Can astigmatism occur alongside myopia? Does hyperopia go away on its own? This article explains everything clearly, with practical examples and no complicated medical jargon.

At Òptica Florit we have been conducting vision exams in Barcelona's Eixample district for over 110 years. These are the questions our clients ask most about their prescriptions — and here are the answers.

The Three Most Common Refractive Errors

Perfect vision occurs when light rays entering the eye focus exactly on the retina. Refractive errors are faults in this process: light doesn't land in exactly the right place and the image appears blurry.

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Myopia

The eye focuses in front of the retina. Near objects are clear but distant ones are blurry.

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Hyperopia

The eye focuses behind the retina. The eye strains to compensate, causing visual fatigue.

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Astigmatism

The cornea is not perfectly spherical but slightly oval. Images appear distorted or doubled at any distance.

✅ Key facts: According to the World Health Organization, more than 40% of the world's population is myopic, and astigmatism affects around 30%. Mild hyperopia is very common in childhood but tends to decrease with age.

Myopia: Clear Up Close, Blurry in the Distance

Myopia (from the Greek myops, "one who squints") is the world's most widespread refractive error and has increased dramatically in recent decades. Its main cause is an eyeball that is too long (long anteroposterior axis) or a cornea that is too curved, causing light rays to converge before reaching the retina.

🎯 How it affects vision

A myopic person can read without difficulty, see their phone clearly and work at a computer with no effort. But when they look up to see someone across the street, read the classroom board or check a scoreboard at a sports ground, the image is blurry and unclear. The higher the myopia (the larger the negative dioptre number), the closer objects need to be to appear sharp.

Most common symptoms of myopia

Blurred distance visionDifficulty seeing signs, faces or the TV from a certain distance.

SquintingInstinctive gesture to improve sharpness — hence the Greek name.

HeadachesFrom the effort of trying to focus on what can't be seen clearly.

Night-time difficultyEspecially noticeable when driving at night with oncoming headlights.

Moving closer to screensTendency to lean in towards the computer, book or television.

⚠️ Childhood myopia: Usually appears between the ages of 6 and 14 and can progress until 20–25. Annual eye exams during these years are essential to detect it and monitor its progression. Insufficient exposure to natural light and excessive near-work are contributing factors.

Hyperopia: The Eye That Works Too Hard

Hyperopia is almost the opposite of myopia: the eyeball is too short or the cornea has too little curvature, so light rays would focus behind the retina. The eye compensates through the ciliary muscle, which increases the curvature of the lens to focus — but this constant effort is exhausting and produces symptoms even when the patient seems to "see fine".

🎯 The deception of hyperopia

Many people with mild hyperopia see reasonably well, especially when young, because their accommodation system compensates for the error. But that constant muscular effort produces eye strain, headaches and fatigue when reading or using screens. With age (from around 40 onwards), the lens loses flexibility and compensation becomes impossible — that's when hyperopia seems to "suddenly appear" in people who thought they had perfect vision.

Most common symptoms of hyperopia

Reading fatigueDifficulty sustaining concentration on printed text or screens.

Frontal headachesEspecially at the end of the day or after prolonged close work.

Tired-eye sensationBurning, heaviness or itching, especially late in the day.

Blurred near visionIn high hyperopia or with advancing age, actual difficulty reading.

Childhood squintIn children, uncorrected hyperopia can lead to a lazy eye (amblyopia).

🚨 Important in children: Undetected hyperopia in childhood is a common cause of lazy eye (amblyopia). Children's vision checks are essential before age 5, even if the child appears to see normally.

Astigmatism: When the Cornea Isn't Round

Astigmatism occurs when the cornea (the transparent surface of the eye) or the lens is not perfectly spherical, but shaped more like a rugby ball than a football. This causes light rays to focus at more than one point, producing blurry or doubled images at both near and far distances.

🎯 How it affects vision

Astigmatism produces a characteristic distortion: straight lines may look tilted or slightly curved, letters appear doubled or have a "shadow", and night-time lights (such as car headlights or street lamps) appear as streaks or halos. Unlike myopia, astigmatism does not improve or worsen based on distance — the image is distorted at all ranges.

Most common symptoms of astigmatism

Distorted visionStraight lines appear curved or tilted; text has a "shadow".

Night-time glareLights appear as stars or streaks (halos around light sources).

HeadachesFrom constant effort to focus through an irregular cornea.

Eye fatigueTiredness when reading or working at a screen for extended periods.

Reading difficultyLetters appear to move or overlap, making fluent reading harder.

📌 Astigmatism is very common: Most people have a small degree of astigmatism and many don't know it because it doesn't exceed 0.50 dioptres, which the eye can compensate for on its own. Only when it exceeds a certain threshold does it produce symptoms that require correction.

Differences at a Glance: Comparison Table

Feature	Myopia	Hyperopia	Astigmatism
Cause	Eye too long / cornea too curved	Eye too short / cornea too flat	Non-spherical cornea or lens (oval shape)
Where light focuses	In front of the retina	Behind the retina	At multiple points simultaneously
Vision affected	Blurry in the distance	Strain for near vision (and far in high degrees)	Distorted at any distance
Main symptom	Distance blur, squinting	Eye fatigue, headaches	Double or shadowed vision, night halos
Prescription	Negative dioptres (−1, −3, −6…)	Positive dioptres (+1, +2, +4…)	Cylinder + axis (e.g. −1.00 cyl. at 90°)
Can it be combined?	Yes, with astigmatism	Yes, with astigmatism	Yes, with myopia or hyperopia
Correction	Diverging lenses (concave)	Converging lenses (convex)	Toric lenses

Can All Three Coexist?

Yes — and in fact this is very common. Most people who have myopia or hyperopia also have some degree of astigmatism. This is why a glasses prescription usually contains two types of numbers:

Sphere
The myopia or hyperopia. A negative number indicates myopia; a positive number, hyperopia. Example: −2.50 means 2.50 dioptres of myopia.
Cylinder + Axis
The astigmatism. The cylinder indicates the magnitude of the astigmatism and the axis (0° to 180°) shows the orientation of the irregularity. Example: −1.00 cyl. at 75° means 1 dioptre of astigmatism oriented at 75°.
Addition
Presbyopia (reading addition). Only appears for people aged 40–45 and above. It's added to the distance prescription to calculate the near correction. It indicates that progressive lenses or a separate reading prescription are needed.

✅ Real prescription example:
RE: −2.50 / −1.00 × 75° — right eye: 2.50 myopia + 1.00 astigmatism at 75°
LE: −1.75 / −0.75 × 165° — left eye: 1.75 myopia + 0.75 astigmatism at 165°
Having different prescriptions in each eye is completely normal.

Correction Options

All three refractive errors can be corrected in several ways. The choice depends on the prescription, lifestyle, age and personal preference:

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Prescription glasses

The most comfortable and accessible option. Today's single-vision, progressive and bifocal lenses correct all three errors with total safety — suitable for any age and prescription.

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Contact lenses

Available for myopia, hyperopia and astigmatism. Toric lenses correct astigmatism with great precision. Daily, fortnightly and monthly options are available.

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Orthokeratology (Ortho-K)

Special lenses worn only at night that temporarily reshape the cornea, allowing clear vision without correction during the day. Very effective for controlling childhood myopia.

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Refractive surgery

Procedures such as LASIK or PRK correct the error by reshaping the cornea with a laser. Requires a stable prescription for at least 2 years and is not suitable for everyone.

⚠️ About refractive surgery: It's a valid option for many patients, but not all. A thorough preliminary examination (corneal topography, pachymetry, etc.) is essential to determine whether you're a candidate. At Florit we can advise you and refer you to the right specialist.

Common Myths About These Vision Problems

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"Wearing glasses makes your eyesight deteriorate faster"

Completely false. Glasses correct the error but do not cause or accelerate it. Not wearing them, however, forces the eye to make unnecessary and constant effort.
✅ Truth: glasses don't worsen your vision — they correct it.
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"Hyperopia corrects itself with age"

It's actually the opposite: with age and the loss of lens flexibility (presbyopia), hyperopia becomes more apparent and harder to compensate for.
✅ Truth: hyperopia requires correction, especially from age 40 onwards.
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"Astigmatism is a serious disease"

No — astigmatism is a refractive error, not a disease. Most cases are mild and are corrected perfectly with glasses or contact lenses.
✅ Truth: astigmatism is very common and has a simple solution.
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"Eye exercises can eliminate myopia"

There is no scientific evidence that eye exercises correct myopia, hyperopia or astigmatism. These are structural errors, not muscular ones.
✅ Truth: optical or surgical correction are the only proven methods.

When Should You Get Your Eyes Checked?

We recommend booking a vision check if:

You can't remember your last eye exam (or it's been more than 2 years).
You notice you need to get closer to screens or books than before.
You suffer frequent headaches when working at screens or reading.
You have school-age children — a check before age 5 is recommended, then every year.
You drive at night and notice excessive halos or glare around lights.
Your prescription has changed and your current glasses no longer feel right.
You are over 40 and starting to notice difficulty reading or seeing up close.

✅ At Òptica Florit: We carry out comprehensive vision exams with state-of-the-art equipment — corneal topography, aberrometry, tonometry, and objective and subjective refraction. No rush, no queues: thorough consultation and examination every time.

Frequently Asked Questions

Can I have myopia and astigmatism at the same time?

Yes, it's very common. In that case the prescription will have a negative spherical component (myopia) and a cylindrical component (astigmatism). Lenses that correct both are called toric lenses and are available in both glasses and contact lenses.

Can myopia stabilise, or does it always progress?

In most cases, myopia stabilises around age 20–25, when the eye finishes growing. During childhood and adolescence it can progress more rapidly. Treatments to control myopia progression in children include special lenses, orthokeratology and atropine eye drops.

What's the difference between presbyopia and hyperopia?

Although both cause difficulty seeing close up, they are different conditions. Hyperopia is a structural eye defect (present from birth). Presbyopia is the natural ageing of the lens that occurs from around age 40–45 and affects everyone — even myopic people.

Can children have astigmatism?

Yes, and in fact astigmatism is usually congenital. In children, uncorrected astigmatism can hinder learning at school and, if significant, may lead to amblyopia (lazy eye). It is essential to detect it during children's eye exams.

How long does a vision check at Florit take?

A complete exam with us takes between 30 and 45 minutes. It includes a case history (visual background), objective refraction with an autorefractor, subjective adjustment, binocular vision assessment, and where necessary, additional tests such as topography or tonometry.