7 Warning Signs of Night Blindness You Shouldn’t Ignore

Introduction

Are you facing difficulty seeing at night while driving on your way to Home from work? Perhaps you’ve been anxious about entering a poorly lit places for fear of losing your way in the gloom. These issues, which occur on a daily basis, may be signs of early night blindness that you should notice.

Nyctalopia, commonly referred to as night blindness, is more than just difficulty seeing in the dark. It is a visual problem that causes you to lose your ability to see in low-light conditions. This disease strikes the rod cells in your retina, which are the specialized photoreceptors (light-sensitive cells) that allow you to see in the dark. In a country like Bangladesh where the streets are often dark and the power goes out all too frequently. It’s crucial to be able to recognize the signs of night blindness for your safety and your health.

Recent health data suggest the prevalence of vitamin A deficiency is still a significant problem in certain areas of Bangladesh resulting in preventable eye blindness [1]. Never ignore the early symptoms of night blindness, whether it is due to lack of nutrients, inherited conditions or changes occurring with age.

In this comprehensive article, we will check out some of the key medical signs and symptoms of night blindness and their impacts on day-to-day living. You’ll also discover how to do a simple self-assessment, and when it’s time to see an eye specialist such as Dr. Masud Hashmee for the proper diagnosis and treatment.

What Is Night Blindness (Nyctalopia)?

When you have night blindness, it doesn’t mean that you are completely unable to see in the dark. It simply means that you have difficulty seeing at night, or in dim light. The word ‘nyctalopia’ comes from Greek roots meaning ‘night’ and ‘blindness’.

Your eyes have two kinds of photoreceptor cells — cones that allow you to see color during the day and rods that help you see at night. Rod cells, which are largely located in the peripheral retina, help you see in the dark and adjust to it. When these cells function poorly, you have trouble seeing at night.

Nyctalopia is an obvious sign of other problems, rather than a disease in its own right. It can mean other issues with the retina, not enough nutrients or eye problems. The problem could also be temporary and resolve on its own (a vitamin A deficiency, say), or it could be permanent (a genetic retinal disease like retinitis pigmentosa).

Typical symptoms of night blindness affect your dim light vision, which is your vision capability in low light/dark conditions. Your daytime vision could still be very normal. That’s why many people don’t realize they have the disease until they are required to drive at night or move in dark places.

In Bangladesh, due to differences in access to good food, it is therefore particularly important that we understand the early signs of ‘intensifying‘ vision loss [2].

If you are interested, read our blog about night blindness causes, symptoms & treatments. 

Recent figure of the eye anatomy, Rod and cones

Understanding Night Blindness: 4 Core Symptoms

That people who are night blind are most likely to get hurt and then suffer all sorts of accidents in the beginning. In such a case, you have one or more of these medical signs. Having a grasp of these main symptoms and how they impact your daily life will help you determine when it’s time to meet an eye doctor like Dr. Masud Hashmee.

Infographic of symptoms and implications

Symptom #1: Difficulty seeing in darkness or low light

The primary symptom of night blindness is difficulty seeing at night or in dimly lit environments. You might see this when:

• Entering a dark movie theater and struggling to find your seat yet everyone else manages just fine
• It’s hard to read in restaurants or even cafes that don’t have a lot of brightness.
• That is particularly tough to move-about in dark hallways at Home.
• It also take way longer than most people to see in darkness.

Most people need 2 to 5 minutes for their eyes to become fully adapted to the dark. Failure of rod cells is when it takes your eyes longer than five minutes to adapt to darkness, or they never quite do. Your eyes may feel “stuck” in bright mode, which means you don’t see well in dark places where others have no trouble.

This form of poor night vision typically becomes worse with time. What begins as a touch of discomfort in low light can become serious issues regarding mobility and security. When your contrast sensitivity is low, it means you have difficulty distinguishing between things and their backgrounds.

Impact on Driving: When driving at night this symptom is really dangerous. You can also struggle to be able to see traffic signs at the normal distances, see lane markings on highways or get too much glare coming at you from oncoming headlights. This is a huge safety issue on the dark streets and roads of Bangladesh. Don’t drive if you are scared of driving in the dark until you consult an eye doctor like Dr. Masud Hashmee.

Normal Vs Night Blindness Vision when you are driving

Symptom #2: Long dark adaptation or no dark adaptation

Dark adaptation is the ability of your eyes to change from light places to dark ones. This process generally takes 2 to 5 minutes, as your rod cells produce rhodopsin, the pigment that assists you with night vision.

If you have nyctalopia, your eyes may take as much as 10 minutes or more before they adapt to the dark or they may never do so entirely. This happens because:

• The Rod Cell isn’t regenerating rhodopsin properly.
• Not enough vitamin A is available to produce rhodopsin.
• Rod cells are damaged or malfunctioning.
• The cells of the retinal pigment epithelium (outer layer of the retina) are not functioning properly.

You could identify these condition:

• Moving inside after being in  bright light and remaining “blind” for a long time
• Entering from a bright hallway to a dark bedroom
• Stumbling around trying to find the light switch in dark room

This prolonged adaptation period is also a symptom of night blindness. Even in the dark, your eyes seem like they can’t handle it, causing poor visibility during semi-darkness. This is one of the earliest and most easily noted signs of night blindness that should not be overlooked as a natural part of aging or simply tired eyes.

Symptom #3: Halos and glare around lights for no reason

If you see halos or excessive glare around lights at night (for example, all the street lamps seem to have rings around them), that’s a clear sign of your night blindness. So, the bad signs of night vision (or vision at night) are:

• Distorted vision or rainbow rings around car headlights
• Street lights that appear to be “bleeding” or feature long glow of lights
• Uncomfortable glare from indoor lights
• Sensitivity to light (photophobia) when it’s dark outside

The reason this happens is:

• Inaccurate refraction of light refracted by the cornea or lens
• Pupils that become too large at night
• Alterations of the optical system of the eye causing light to scatter
• Irregularities and opacities on the cornea

Halos around lights can indicate cataracts or other eye problems, but when they accompany other symptoms of night blindness, they suggest a low light vision deficit. The degree of worsening halos roughly corresponds to the degree of worsening nyctalopia, and this is an important symptom to monitor.

Drawing of halos around car headlights

Symptom # 4: Less peripheral vision in the dark (Tunnel vision)

Tunnel vision at night is an important sign of night blindness, particularly in things like retinitis pigmentosa (deterioration of light sensitive cells of eye). In such a scenario, your peripheral vision (side vision) can appear to vanish, but your central vision remains relatively unchanged.

Why the periphery gets hit first: The peripheral retina has more rod cells, and the center has more cone cells. In the dark, you lose your peripheral vision before you lose your central vision because nyctalopia primarily involves rod cells.

The impact of this condition on real life:

• Not seeing people or things coming from the sides.
• Bumping doorframes while looking straight ahead.
• Missing obstacles of stairs while walking in the dark.
• Feeling lost in dark as if in unfamiliar territory.

This slowly deteriorating visual field deficit (beyond the central visual field area) makes it very difficult to see where you are going, and so increases the risk of falling, a particular concern in older populations. If you are experiencing this and other night vision issues, you should definitely see a doctor to rule out retinitis pigmentosa or another retinal disease.

How Night Blindness Affects Your Daily Life

Night blindness is much more than just the four main symptoms, it makes everything you do daily far more difficult. Understanding how these factors affect you can enable you to know when your vision problem is causing your life to be riskier and less enjoyable.

Impact #1: Reduced mobility and increased risk of falls

This means that in low light you can bump into things, or trip, a lot of the time because your reduced dark vision. This is not a distinct symptom, but evidence that your night vision has gotten worse.

When you lose your sense of space in low light, dangerous functional vision loss can occur, which makes everyday tasks more difficult. This classic symptom of night blindness occurs because:

• In low light, poor depth perception.
• As contrast sensitivity decreases, things start to merge into their background.
• You can’t easily calculate space when your night vision is diminished.
• Your brain doesn’t process visual information well in low light.

Common situations:

• Bumping into stuff while walking around your house at night.
• Falling down stairs in poorly lit areas.
• Missing judging edges of doors and running into frames.
• Knocking things off tables in very general dark rooms.

These things that occur are not merely annoying; they are genuinely hazardous, particularly for older adults who tend to fall and get injured. If your family has mentioned how clumsy you are in the dark, or you’ve begun installing more night lights around the house, it’s a sign that your nyctalopia is preventing you from moving as easily as before.

Impact #2: Headaches resulting from eye strain, fatigue and more

Eye strain and headaches aren’t the symptoms themselves, but rather your body informing you that you’re straining more in dim light.

Eye strain is the most common consequence of night blindness, but headaches — also a side effect — are equally frequent. If there’s not enough light, then your eyes have to work harder to see, and that brings forth:

Signs and symptoms:

• Asthenopia (eye strain) following exposure to low-light environments.
• Common tension headache at front or back of head.
• Eyes that hurt and feel heavy.
• Too much water in the eyes.
• Constant squinting (squeeze eyes) causes the muscles in your face to tight up.

Your ciliary muscles, which control focus, work too hard in order to compensate for the fact that your rod cells aren’t functioning properly. The continuous contraction tenses the muscles of the eye and in other tissues, leading to headaches and visual discomfort.

These symptoms are worsen after doing activities in poor lighting (socializing at night, reading at night, eating out at restaurants with low light). That’s not the same as computer eye strain. Your body is compensating for your bad dark vision by tiring your eyes.

If you frequently experience these same symptoms after emerging from dark buildings, among other warning signs, then you may want to schedule your comprehensive eye exam.

Impact #3: Impact on Mental and Social Health

The symptoms of night blindness can lead to changes in behavior that reduce your enjoyment of life. You might be:

• Avoiding social occasions in dimly lit restaurants or other night venues.
• Declining invites to movies or evenings out.
• Concern about after-dark activities.
• Reduced freedom and reliant on others to get around.
• Avoiding any work or social activity that needs driving at night.

Such activities that people use to avoid things play a protective role, but they can also adversely affect their social life and quality of life. So many people have no idea how much they’ve restricted their lives. Dr. Masud Hashmee is no stranger to how difficult these things can be, and he helps patients regain their vision and confidence in low light environment.

How do you know if you are night blind?

You should get a professional diagnosis, but you can also do a self-assessment to see if you might have night blindness and need to go the doctor.

A quick way to see if you have night blindness, select any symptoms that apply to you:

☐ I have difficulty seeing at night or in dimly lit areas.

☐ I have trouble driving at night.

☐ It takes my eyes more than 5 minutes to adjust to darkness.

☐ I see halos or too much glare around lights in the dark.

☐ I lose side vision when it gets dark.

☐ Bumping into objects or stumbling happens often in low light situations.

☐ My head is hurting/throbbing up after spending time inside of a dim environment.

☐ Night vision has worsened over the past few months. 

☐ Avoid nighttime events because of my decreased amount ability? 

☐ Family members commenting about how poor my night problems are.

Your Score:

0–2 things checked: Monitor your vision, it may simply be natural variation.

3–4 checks: Schedule an appointment to get your eyes checked within the next few months.

5–6 checked items: : Go to see an eye doctor within 2 weeks.

7–10 boxes checked: Immediately see a doctor, like Dr. Masud Hashmee for a screening.

Self-assessment checklist graphic

How to Check Yourself for Night Blindness at Home

It is important to have a professional diagnosis- visual field testing and electroretinography (ERG) are crucial even though you can do a simple dark adaptation test at Home:

Easy screening test:

• Sit in a room that has good lighting for 10 minutes.
• You’ll want a room that is totally dark, but safe and obstacle-free.
• Time it with a stopwatch until furniture silhouettes appear sharpened.
• Normal: 2 to 5 minutes
• Approximate: 10 minutes or longer, or not quite settling in ever

This Home test is NOT a diagnosis, it is only an initial screening. If you suspect that you could be nyctalopic because you experience symptoms similar to night blindness, schedule an appointment with an ophthalmologist (eye doctor) for a comprehensive eye examination. This should consist of dark adaptometry, fundus examination, and slit lamp examination.

When should you see an eye doctor?

Knowing when to seek professional care for the early symptoms of night blindness can help ensure your sight is protected and preserve vision.

Needs Attention Right Away:

Seek immediate help from an eye doctor if you have any of the following:

• Acute onset of night blindness.
• A recent injury or trauma to the eye.
• Night blindness with pain in the eyes
• Flashing lights or floaters (spot) in your field of vision.
• Loss of vision at night.

Please make an appointment in one to two weeks, symptoms are:

• Night blindness is progressively worsening.
• Three or more night blindness warning signs.
• Unable to perform daily activities safely. 
• Fears regarding being on the road or using stairs.
• A Family medical history of retinal disease or retinitis pigmentosa.

Routine Screening– schedule a comprehensive eye exam, if you are:

• Are older than 40.
• Have diabetes (need to be screened every year).
• Experience mild symptoms for the first time.
• Haven’t had an eye exam in over two years.
• Are looking for only diet-specific or nutritional information.

What You’ll See When You Visit:

Schedule a comprehensive eye exam, Dr. Masud Hashmee will:

• Complete eye examination and vision tests.
• Testing the ability to our eyes to adapt in darkness, how well rod cells function.
• Diagnosing with a peripheral vision exam.
• Inspecting the retina with an ophthalmoscope.
• If available, optional electroretinography (ERG) to assess retinal function.
• Assessment of vitamin A and zinc in the diet.
• Discussing treatment options based on the diagnosis.

Conclusion

You can figure out when to see a doctor once you know the four key symptoms of night blindness: difficulty seeing at night, taking forever for your eyes to adjust to the dark, halos around lights, or decreased peripheral vision. You can also know they should see a doctor when your symptoms start to impact your ability to drive, get around or live on a day-to-day level.

If you have difficulty driving at night on a regular basis, if it takes an extended period of time for your vision to adapt from light to darkness or vice versa, or other common symptoms of night blindness that are listed here (except for those mentioned previously) you do not need to allow things get worse. Many things, like cataracts and a deficiency of vitamin A, can be treated very successfully when caught early — perhaps even eliminating your symptoms completely.

For those in Bangladesh with difficulty navigating dark streets and places where vitamin A deficiency remains a problem, good eye health can help keep you safe and independent. Early treatment can have a huge impact, whether your nyctalopia is being driven by dietary deficiencies, a disease like retinitis pigmentosa or glaucoma (damaged optic nerve), or some other issue with the retina.

When you know the signs of night blindness, they enable you to take control of your eye health. The self-assessment tools and Home screening tests in this guide are a great start, but they do not replace a professional eye exam. Without a complete set of tests, which could include electroretinography, visual field testing and checking out the back of the eye (the fundus), you won’t know for sure what is causing your night vision issues.

Dr. Masud Hashmee is one of the top eye specialists in Bangladesh. Please see him for a thorough eye exam. Dr. Masud Hashmee has decades of experience helping patients with eye problems and utilizes the most advanced diagnostic tools to determine what’s behind your symptoms and then develops a unique treatment plan to aid you in seeing better at night.

Night blindness need not rob you of safety, independence or quality-of-life concerns. There is an effective treatment for this disease which include vitamin A supplements, dietary therapy wearing of spectacles and cataract surgery. Today is the day to start: 

• Seeing much better at night, where you probably need it most, and 
• Taking care of your eyes.