What is Low vision, what are its causes, and when should you go for an eye exam?

If road signs become less clear, or you start holding your phone further away to read, it is natural to ask: What is Low vision? This term describes a change in visual clarity, but it does not specify a single diagnosis. You may need to update your glasses prescription, or the cause may be dryness or a health problem that requires an ophthalmologist.

 Most importantly, distinguish between gradual blurriness, which warrants a routine check-up, and sudden changes that cannot wait. In this guide, you will learn about the signs of Low vision and common causes, the relationship between headaches and vision problems, and the appropriate next step for treatment.

What is Low vision?

Low vision is not the name of a specific disease; rather, it is a description of a reduced ability of the eye to see details clearly at near, far, or both distances. 

The most common issue people encounter is that light rays do not focus on the retina optimally due to the shape of the eye, cornea, or lens. Clarity may improve with prescription glasses designed for an individual prescription. 

The World Health Organization explains that uncorrected refractive errors are a major cause of Low vision in children and adults, but they are not the only cause of every visual complaint.

What are the most common types of Low vision? 

Nearsightedness: In this case, distance is blurry and near is clearer

With nearsightedness, distant details are less clear: it may be difficult to read a sign while driving or distinguish writing on a distant screen, while reading a phone from a close distance is relatively easier. Nearsightedness sometimes appears during studies, and its degree may change with growth. The need for glasses is not determined by symptoms alone; rather, it is determined by the refraction measurement and the extent of its impact on daily life.

Farsightedness: It may cause strain during near tasks

In farsightedness, the visual system needs extra effort to focus, and the person may notice blurriness or fatigue during reading and near work. Some children can temporarily compensate for part of their farsightedness with their ability to focus, so the absence of a complaint may not be evidence of no problem. 

Astigmatism: Distortion or blurriness across distances

Astigmatism usually results from a difference in the curvature of the cornea or lens, and it may make lines and edges less sharp or cause eye strain and headaches in some people. It can accompany nearsightedness or farsightedness. The Saudi Ministry of Health explains that symptoms alone do not prove the condition, as they may resemble other conditions, and a vision test remains the means of knowing the cause.

Age-Related Vision Loss: Increasing difficulty seeing near

With age, especially after around forty, the eye lens's ability to focus on near distances decreases. You may find yourself holding the menu or phone further away to read more clearly. This is called presbyopia, and it does not necessarily mean there is a serious disease, but the examination remains important because changes in vision may coincide with other problems.

Cause of Low Vision: Why Does Vision Change from Person to Person?

The cause of Low vision cannot be accurately determined by relying on headaches or blurriness alone. First, ask: Is the problem with distance or near vision? 

Is the change constant or intermittent? Did it start over months or suddenly? And are there accompanying symptoms such as pain or redness? These details distinguish between a refractive error that often benefits from correction, and a problem with the surface of the eye or inside it that requires another examination. Several factors may combine in the same person, including: 

• The shape of the eye or the curvature of the cornea and lens: It changes the way light focuses, which is the basis of many refractive errors.

• Age: It affects the eye's ability to focus near, and it may be accompanied by other changes in lens health.

• Dry eye: It may cause fluctuating vision and burning or a gritty feeling, especially with air conditioning, screens, and periods of reduced blinking.

• Medical conditions: Such as diabetes, or some diseases of the cornea, lens, and retina, and they may require a comprehensive medical examination.

• An old vision measurement or uncomfortable frame: They may increase visual discomfort, but they do not automatically explain every new change in vision.

Signs of Low Vision: Signs in Reading, Driving, and Work

Among the most important signs of Low vision is that facial details or signs become less sharp, or you have to squint to improve clarity, or reading errors recur from a usual distance. An annoying glare may appear around lights while driving at night, or frequent fatigue after using the computer. But these signs are not exclusive to retinal problems; some eye diseases may cause similar symptoms, and dry eye may lead to blurriness that changes during the day. If you notice a difference between the eyes, tell the specialist even if your vision seems good when using them together.

Does Low Vision Cause Headaches? And When Is the Relationship Likely?

The answer: Yes, uncorrected refractive errors or those corrected with an unsuitable prescription may be associated with eye strain and headaches, especially after near work or reading for a long time. The American National Institute of Eye Health lists headaches among the possible symptoms of refractive errors, but it does not consider it a sufficient diagnostic sign. Therefore, it is not correct to attribute any headache to glasses, nor to rely on the intensity of the headache to determine the degree of vision.

People often search for Low vision headaches when the pain appears near the end of the workday or after studying. Write down the time the headache appears, whether it is accompanied by blurriness, and whether it subsides after a break. However, if it is accompanied by sudden vision loss or severe eye pain, seek urgent medical care instead of waiting to renew your glasses.

Does Excessive Screen Time Cause Low Vision or Only Eye Strain?

When staring at a phone or computer for a long time, blinking decreases in some people, so the surface of the eye dries out and vision becomes fluctuating. Strain may occur from continuous focusing, especially with uncomfortable lighting and reflections. But the feeling of fatigue after a long screen time does not prove on its own that the glasses prescription has changed. With children, increased near activities and less time outside the home are associated with risk factors for nearsightedness, which makes daily balance important alongside following up on measurements.

Routine Vision Measurement: Why Do You Need It?

Routine vision measurement often goes through the following steps to avoid long-term vision problems:

1. Asking about symptoms, current glasses, and medical history.

2. Measuring visual acuity for each eye separately.

3. Estimating the degree of refraction and trying suitable lenses.

4. Explaining the result and prescription, and determining the need for an additional vision test.

And you can do this by visiting Five Season Branches to do it for free.

When Are Signs of Low Vision a Routine Appointment and When Do They Become Urgent?

Book a vision test soon if:

If vision is changing gradually, or you start having difficulty reading signs or screen details, or your old glasses become less comfortable, book a refraction measurement and do not delay it for long. Bring your glasses and previous measurement result if available, and explain in which activities the problem appears. And if the new examination result does not address the complaint as it should, discuss having a broader medical examination.

Seek urgent medical care if:

Sudden vision loss, or the appearance of a dark curtain over part of the visual field, or a sudden increase in floaters with flashes of light, or severe pain and noticeable redness; all are reasons to seek immediate medical care. 

Frequently Asked Questions About Low Vision and Eye Examination

Should I bring my old glasses for the examination?

Yes, it is best to bring your current glasses and the latest vision measurement result if available. This information helps the specialist compare the new measurement with the previous one and understand the cause of the change in vision or discomfort. And tell them when the symptoms started, whether they appear while driving or reading, and whether you suffer from headaches or blurriness in one eye.

Is vision measurement painful?

Usually not; vision measurement usually involves reading symbols on a chart, assessing visual clarity for each eye, and trying different lenses to determine the most suitable correction. The steps may take time that varies depending on the condition. And if symptoms appear that require an additional medical examination, the specialist explains the required procedures, and may refer you to an ophthalmologist if necessary.

Does blurriness mean I need new glasses?

Not necessarily; blurriness may result from a change in the glasses prescription, but it may also be associated with dry eye or other health reasons. If blurriness recurs or persists, you can have an examination to find the cause instead of buying new lenses directly. However, sudden vision loss or severe pain requires urgent medical care without waiting.

What is the difference between nearsightedness, farsightedness, and astigmatism?

In nearsightedness, distant objects are usually less clear, while farsightedness may cause strain when focusing on near objects. As for astigmatism, it may lead to blurriness or distortion of details at different distances. More than one refractive error may combine in the same person, and the type is not accurately determined except by a proper measurement.

Does Low vision cause headaches?

Headaches may be associated with eye strain resulting from an uncorrected refractive error or an unsuitable glasses prescription, especially after reading or working in front of a screen. But headaches have many causes, and their cause cannot be determined by the location of the pain alone. 

When do I need a vision measurement and when should I see an ophthalmologist?

If blurriness becomes gradual or your glasses are no longer comfortable, a vision measurement may be an appropriate step. However, severe pain, sudden vision loss, or the appearance of a curtain over the visual field requires urgent medical care. And a glasses measurement does not replace a medical examination when a disease is suspected.

Before the visit, write down when the symptoms started, whether they appear in one eye or during reading and driving, and bring any previous prescription.

 And to prepare for the visit, read Eight Questions for the Optometrist During the Examination to know what is worth asking about when reviewing the examination.

What do you do after knowing the glasses measurement?

If the measurement confirms that the corrective lenses are suitable, choose them according to your daily needs. Five Season's Explanation of Medical Lens Types helps you understand the options designed for near, far, and multifocal vision. First, make sure the prescription is correct, then choose the frame suitable for your activity and comfort.

Vision Examination in Riyadh: A Practical Step After Reading the Guide

If you notice gradual blurriness, you can have a free vision test at Five Season Branches, starting from our Book a Vision Test Appointment page.