Everything About Night Blindness Causes & Treatment

​Introduction

Is it becoming harder for you to make your way through your home in the middle of the night? Do you struggle to see anything when you walk into a dark restaurant?If you are a driver and find it difficult to drive at night, you are not alone.

It is difficult to see in low light or darkness if you have a condition called night blindness (nyctalopia). Many people dismiss this as a common side effect of getting older.

In fact, it is usually a treatable symptom of underlying eye conditions that should be addressed by medical professionals.Night blindness affects millions worldwide and can be a major risk to your lifestyle. Night vision problems often happen with poorly corrected eyesight.

In Bangladesh, it can be more than just inconvenient. Many people are not aware of their own night blindness. However, it can make a big difference for their safety.

This guide covers what you need to know about night blindness. You’ll learn to spot symptoms, understand causes, and find treatment options to help you regain night vision.

What you’ll find in this guide:

• Straightforward explanations of what night blindness is and how it affects one’s vision
• Danger signs to watch out for (and not ignore)
• A look at common and less common causes, from vitamin deficiency to hereditary conditions
• Advanced Lab- and Imaging Diagnostics to pinpoint the cause
• Evidence-based care specific to patients and their cases

Dr. Masud Hashmee, a leading eye specialist and phaco surgeon at Bangladesh Eye Hospital in Dhaka, has helped thousands of patients overcome night vision problems through accurate diagnosis and personalized treatment.

With over 23 years of ophthalmology experience and specialized training from Moorfields Eye Hospital in London, Dr. Hashmee combines international expertise with a deep understanding of eye health challenges in Bangladesh.

Masud Hashmee is examining a patient with advanced eye equipment

If night blindness is impacting your life for the worse, get help. An early diagnosis can stop additional vision loss and, in many instances, save the ability to see clearly after dark.

Night Blindness (Nyctalopia) Explained

What is Night Blindness?

Night blindness is not a disease. It is a symptom of a condition that keeps your eyes from adjusting to low light. The term nyctalopia comes from Greek words meaning “night” and “blind.”

You have night blindness if, for example, you find it difficult to see when walking from a lighted room into darkness. This is not the temporary adjustment period that everyone goes through when moving from bright light to darkness.

The average dark adjustment is a few minutes. With night blindness, your eyes either adjust very slowly or don’t adjust well at all.

How Your Eyes Adapt to Darkness

Your retina, the light-sensitive tissue at the back of your eye, has two kinds of photoreceptor cells: rods and cones. Cone cells work best in bright light and let you see colors and small details.

Rod cells are very sensitive to light. They help you see in dim conditions. Each eye has about 120 million rod cells, much more than the 6 million cones .

Rod cells rely on a unique light-sensitive protein called rhodopsin (also called “visual purple”). When light hits rhodopsin, it starts a chemical reaction that tells your brain you see. In the dark, your eyes make more rhodopsin to help you see at night.

An anatomical diagram showing rod and cone cells in the retina

Night blindness happens when something interrupts the dark adaptation process. This could be from low rhodopsin production (often from vitamin A deficiency), damaged rod cells (due to genetics or retinal degeneration), blocked light transmission (such as cataracts or cornea issues), or nonfunctional brain signals.

Types of Night Blindness

Knowing your type of night blindness helps you find the right plan of action. Doctors classify night blindness by when it starts and if it worsens over time.

Congenital Night Blindness is present at birth, and Congenital Stationary Night Blindness (CSNB) is a rare hereditary disease where night vision loss is permanent. Acquired Night Blindness occurs in adulthood due to a lack of adequate nutrition, eye disease, or systemic illness. It is common in Bangladesh, and many cases are treatable if they’re diagnosed early.

The progressive form, like retinitis pigmentosa (RP), causes rods to slowly degenerate. The US National Eye Institute says RP affects about 1 in 4,000 people. It leads to loss of peripheral vision and tunnel vision (looking through a narrow tube).

Dr. Hashmee’s Expert Insight:

Knowing whether you have inherited (or congenital) or acquired night blindness can help identify the best course of action in treating it. 

In my practice at Bangladesh Eye Hospital, I have witnessed patients improving their night vision after treating ‘vitamin A’ deficiency, and others with inborn disorders benefitting from specialized low-vision aids and lifestyle modifications.

Signs and Symptoms of Night Blindness

Recognizing early signs helps you get timely treatment. The World Health Organization says early detection greatly improves outcomes.

Common Symptoms You Might Have

• Difficulty seeing in dim light – you may struggle to make out objects, people, or obstacles after sunset or in areas with limited lighting, making movement around your environment more challenging.
• Trouble adjusting from bright to dark – your vision takes much longer than usual to adapt when you move from a well-lit place into darkness, such as stepping outdoors at night from a bright room.
• Poor peripheral vision at night – tunnel vision effects in low light
• Blurred vision in low-light – street signs and faces appear fuzzy after dark
• Halos or glare around lights – you may see rings or bright circles around headlights, streetlights, or indoor lighting, which can make it difficult to judge distances when driving or walking at night.
• Decreased contrast sensitivity – inability to distinguish similar shades
• Difficulty recognizing faces – problems identifying people in dim lighting.
• Trouble driving at night – difficulty seeing road signs and pedestrians
• Eye strain and headaches – fatigue from eyes working harder in low light
• Anxiety about nighttime activities – avoiding evening events

Comparison images while driving

​When Symptoms Add Up to Something More Threatening

Contact Dr. Hashmee immediately if you experience:

• Flashes of light in your eye
• A sudden increase in floaters (threads or webs that drift across your vision)
• A dark curtain or shadow in your field of view
• Severe pain in the eyes
• Acute loss of vision that occurs during the day and at night
• Eyes that are red and swollen
• Headaches that affect your vision

Dr. Hashmee’s clinical insight:

If you have a sudden change in night vision, including flashes, floaters, or other visual changes, do not wait. Call our emergency hotline now: +880 1726-277777.

How is it affecting everyday life in Bangladesh?

In Bangladesh, many areas lack street lighting, and people are often out at night. For many, seeing at night is a major worry. Patients at Eye Hospital say:

• Problems with attending night prayers at the mosques
• Relatives who don’t stop the gatherings when the sun has set
• Concerns about the safety of children on their way home after evening classes
• Not getting to the night markets or social gatherings.
• Be concerned with walking in the winter, when it gets dark early.

If you or someone close to you has these symptoms, a complete evaluation by a vitreo-retina specialist can determine what the problem is and help guide you toward appropriate treatment.

​What Causes Night Blindness?

It is important to know the basic cause for effective treatment. Dr. Hashmee uses modern diagnostic tools at Bangladesh Eye Hospital, Malibug, to find exactly what’s wrong with your night vision.

Lack of Nutrients

Vitamin A deficiency is the leading dietary cause of night blindness. The WHO estimates that 250 million preschool children are vitamin A-deficient globally, with the highest prevalence in South Asia and Africa.

Zinc deficiency also contributes because zinc helps metabolize and transport vitamin A.

​Table 1: Vitamin A-Rich Foods Available in Bangladesh

Ser	Food Source	Vitamin A Content (IU per 100 g)	Availability
1	Carrots	16,706	Year-round
2	Sweet Potatoes	14,187	Seasonal
3	Spinach	9,377	Seasonal
4	Pumpkin	8,513	Seasonal
5	Mangoes	1,082	Seasonal
6	Papaya	950	Year-round
7	Eggs	540	Year-round
8	Liver (chicken)	11,078	Year-round

Inherited Retinal Disorders

Retinitis Pigmentosa (RP) is the most common genetic cause of night-blindness, affecting approximately 1 in 4,000 people. 

Night blindness typically begins in childhood as rod cells start to deteriorate and tunnel vision results as peripheral sight shrinks. There is no cure for RP, but finding it early allows parents to better manage and seek genetic counseling and low-vision rehabilitation programs.

Congenital Stationary Night Blindness (CSNB) has been present since someone was born, but is not progressive.

Eyes Age-Related Problems

Cataracts are widespread in Bangladesh, particularly among the elderly. According to research, cataracts cause 60% of blindness in Bangladesh. 

The cloudy lens doesn’t allow as much light to pass through to your retina, and your night vision gradually dims. This symptom can improve significantly with cataract surgery.

With glaucoma (the condition of high pressure in the eye), your optic nerve and peripheral vision are damaged, and that makes it difficult to see at night.

​Long-Term Illnesses

Diabetes is on the rise in Bangladesh. The International Diabetes Federation reports that Bangladesh has 13.9 million adults with diabetes. 

Diabetes affecting the eyes can lead to difficulty with night vision, and managing blood sugar can help prevent your diabetic eyes from getting worse.

Liver disease can affect how the body stores and uses vitamin A, and even if you eat adequate amounts of it you may develop night blindness.

Other Factors

Myopia, or nearsightedness, can worsen when the sun goes down. It’s often safer to drive at night with corrective lenses.

Certain drugs, including quinine, chloroquine, and several glaucoma drugs, can make you temporarily night-blind .

Dr. Hashmee’s Method of Diagnosis:

“Diagnosis alone is everything.” We don’t guess; at Bangladesh Eye Hospital, we use electroretinography, visual field testing, OCT imaging, and blood work to determine the exact etiology of what is causing your night blindness.

If we know the cause, then we can offer you targeted therapy and realistic expectations for your future vision, he added.

Testing and Diagnosis of Night Blindness

The proper diagnosis is your first step to good therapy. At Bangladesh Eye Hospitals, Dr. Hashmee uses different tests to figure out your night vision problem and form a treatment plan just for you.

Full Eye Exam

Dr. Hashmee begins by examining your medical history, current symptoms, medications , and family optical health history.

Modern eye testing equipment is in use.

Important Tests for Diagnosis:

• The Visual Acuity Test employs classic eye charts to get benchmark measurements of your vision in bright and dim environments.
• Dark Adaptation Test is the easiest way to determine whether you are blind at night and aids in determining the cause.
• The Visual Field Test displays the limit of what you see, can detect blind spots, and helps determine the amount of vision loss, if any.
• Electroretinography (ERG) to detect retinitis pigmentosa and differentiate among various types of night blindness.
• Fundoscopy, a dilated eye exam, lets you view your retina, optic nerve, and blood vessels.
• Optical Coherence Tomography (OCT) provides you with a complete set of cross-sectional images of the layers in your retina for precise diagnosis.
• The slit lamp test examines your cornea to look for cataracts or other issues preventing light from passing through.
• Laboratory studies (blood tests) are included to check levels of vitamin A or zinc, as well as blood glucose to screen for diabetes, and liver function tests.
• Genetic testing may be recommended if inherited retinal disease is suspected.

Dr. Hashmee’s Clinical Excellence:

“At Bangladesh Eye Hospital, state-of-the-art diagnostic equipment ensures accurate diagnosis. 

I’ve performed over 2,000 retinal surgeries and examined countless night vision patients. Comprehensive testing ensures you receive the right treatment.”

Contact Bangladesh Eye Hospital at +880 1726-277777 to schedule your evaluation.

​How to Treat Night Blindness

The condition of night blindness is the only factor that dictates treatment. Dr. Hashmee customizes the treatment regimen according to a complete array of diagnostic test reports.

Nutritional Changes

Vitamin A supplementation is the primary course of action for night blindness due to vitamin A deficiency. With follow-up exams,  Dr. Hashmee would monitor your progress and modify supplements as needed.

Diet changes include vitamin A-rich foods every day, such as carrots, sweet potatoes, spinach, liver, fish oil, eggs, and mangoes. While pumpkin, papaya, and leafy greens are available in Bangladesh, they are a good source of the vitamin.

Supporting Nutrients, such as zinc supplements, can help the body use vitamin A more effectively, and supplements of lutein, zeaxanthin, and omega-3 fatty acids are good for your overall retinal health.

Eyewear and Corrective Lenses

If the source of your symptoms comes from refractive error, then eyewear with the best correction can be helpful at night. Non-reflective coatings on eyeglasses would help ensure safe, comfortable nighttime driving by reducing glare from headlights and street lights.

Eye specialists thoughtfully weigh whether night driving glasses with yellow-tinted lenses could help your particular problem, given that the evidence about their effectiveness is mixed.

Comparison of glasses with and without anti-reflective coating at night

Surgical Treatments

Cataract surgery is also great for night blindness due to cataracts. As a skilled phaco surgeon with Alcon USA training, Dr. Hashmee performs a modern cataract surgery utilizing advanced intraocular lens technology. 

The vast majority of patients have a huge improvement in their night vision after surgery.

Retinal Surgery addresses conditions like retinal detachment or severe diabetic retinopathy. Dr. Hashmee’s experience with over 2,000 retinal surgeries ensures expert care. Laser Treatment can aid diabetic retinopathy and certain forms of glaucoma, preventing vision from deteriorating.

Caring for Inherited Disorders

There is no cure for Retinitis Pigmentosa at present, but Dr. Hashmee provides complete management, including low vision care. He also stays in touch with all new medications and clinical trials.

Addressing Systemic Diseases

Diabetes Management is very useful. Dr. Hashmee collaborates with your diabetes care team and emphasizes that controlling your blood sugar keeps diabetic retinopathy from progressing.

Dr. Hashmee’s Treatment Philosophy: “Whether your night blindness requires vitamin supplementation, cataract surgery, or long-term management of inherited conditions, my goal is to maximizeyour vision potential.

My 23 years of experience and fellowship training from Moorfields Eye Hospital, London, allow me to offer both medical and surgical solutions tailored to your diagnosis.”

Preventive Measures for Night Blindness

Ways to Avoid

Nutritional Prevention ensures that individuals do not become deficient in vitamin A by ensuring they have a healthy diet. Mangoes, as well as papayas, are also good among the fruits that are available seasonally in Bangladesh. If you’re at risk, discuss with Dr. Hashmee the possibility of taking supplements.

Routine eye exams can help detect problems early. The American Academy of Ophthalmology recommends that those over 40 undergo complete eye exams, and diabetics even more frequently .

Tending to chronic conditions prevents them from getting worse. Stick to the treatments you’ve been given to help control your blood sugar and blood pressure.

Changes in lifestyle

• Driving at Night: Safety Tips
  • As much as possible, don’t drive after dark.
  • Get used to a spotless windshield.
  • To reduce glare, dim the brightness of your dashboard.
  • Consider another mode of transportation for those evening appointments.

Infographic where you change home lighting as well as recommendations to be safe with night blindness on a daily basis

• Changes to the home:
  • Ensure enough lights throughout the house.
  • Install night lights in the hallways and bathrooms.
  • Install motion-activated lights that come on when you move.
  • Use colors that do not match for steps and things in the way.

Strategies for Daily Living:

• Schedule important tasks during the day to avoid working on them at night.
• Utilize flashlight apps on your mobile.
• Explain the restrictions to family members.
• Do not hesitate to ask for assistance.

Conclusion

Night blindness is a symptom that requires medical attention. Maybe it’s a vitamin deficiency or a genetic issue, but with the appropriate diagnosis can come appropriate therapy and improved outcomes.

Many causes are treatable. It only takes a few weeks to fix a vitamin A deficiency. Surgery can fix cataracts with an excellent result. Early detection is also useful for slowly progressive disorders such as RP,  since it facilitates planning and visual rehabilitation.

Don’t put off the evaluation. Wait too long and you could lose your vision forever, even if treatment might allow you to see in the dark again.

Dr. Masud Hashmee is a specialist in the field of vitreo-retinal diseases, and Bangladesh Eye Hospital is equipped with the most modern diagnostic technology, so you can be sure to receive comprehensive care.  His 23 years of experience include international training at Moorfields Eye Hospital and more than 2,000 documented retinal surgeries. That makes him the person who knows best how to take care of your eyes.

At Bangladesh Eye Hospital, you will get a full assessment, including electroretinography, OCT scanning, and a complete visual field test. Dr Hashmee’s patient-centred approach will ensure that the patients know their diagnosis, line of treatment, and what they can expect in reality.

Don’t allow night blindness to interfere with your safety, independence, or quality of life.

Book your complete eye check-up now:

Bangladesh Eye Hospital is situated at Malibagh, Dhaka. You can get them from +880 1726-277777 and drmasudhashmee.com. Rating on Google: 5.0 out of 5 (50 reviews).

Dr. Hashmee is also the Founding Member of Bangladesh Eye Hospital (Shantinagar Branch), which makes it convenient for Dhaka residents to receive specialized care for their vision needs.

​Frequently Asked Questions

Q 1: What is the disease called night blindness?

The Nyctalopia or night blindness is not a disease; It is a condition. What this means is that something is wrong with your visual system. 

But if you have a family history of such disorders as retinitis pigmentosa, cataracts, glaucoma, or diabetes, then you need treatment.

Q 2: What to do if I am diagnosed with Night Blindness?

Night Blindness is something that some people are born with and others acquire later in life. The problem could be temporary, as when you become deficient in vitamins, or permanent, like being born with inherited retinal degeneration. 

How to treat night blindness. What you can do about it depends on whether the problem is a food issue that can be supplemented or if it’s genetic issues that need ongoing care or any other form of treatment.

Q 3: How do I know if I have night blindness?

If you have trouble seeing at night? You can learn what’s wrong with your eyes and how to successfully cure this condition by visiting an eye doctor. 

They perform dark adaptation testing and electroretinography to help to determine whether a patient may have night blindness and how it might be treated. This way, they can provide the proper treatment instead of guessing.

Q 4: Can blindness at night due to vitamin A deficiency be treated?

Yes, night blindness caused by a vitamin A deficiency can be easily corrected when treated with just the right medication. When you begin taking vitamin A supplements appropriately and eating better, usually your vision improves within a few weeks to months. 

Treatment includes foods such as carrots, sweet potatoes, liver animals (vitamin A); cod liver oil, and green leafy vegetables. Many of them are available in Bangladesh. 

But if a severe deficiency has led to permanent damage in the retina (which is rare but theoretically possible), it might not be completely reversible. That is why it’s so critical that we find it and treat it early.

Q 5: What is the difference between cataracts and night blindness?

Night blindness is a symptom of your body’s difficulty seeing in low light, while cataracts are a physical issue with the lens of your eye as it becomes cloudy. 

And to make that message clear, “The cataract essentially absorbs and scatters light,” says Gloria Flemming, M.D., an assistant professor of Ophthalmology at the University of Maryland Medical Center, which makes it difficult for your retina to see in very dim light. 

Night blindness can also result from any of these conditions unrelated to cataracts, including retinal disorders, vitamin deficiencies, and genetic diseases.

Q 6: What can I do if I have cataracts?

Note that, over time, as people age, cataracts tend to become worse, but they can be surgically fixed easily. A phaco (cataract) surgeon like Dr. Hashmee can immediately determine if cataracts are causing your night vision problems. 

If they are, he can perform advanced surgery that frequently greatly improves night vision by replacing the clouded lens with a clear one known as an intraocular lens.

Q 7: What are the best vitamins to prevent or treat night blindness?

The most important vitamin in curing nutritional night blindness is Vitamin A (retinol), as it’s responsible for manufacturing rhodopsin. 

It is the pigment that enables you to see at night. Zinc helps the body use vitamin A; lutein and zeaxanthin help protect retinal cells; omega-3 fatty acids keep the retina healthy in general. 

Not all night blindness is treatable with vitamins; disorders that are inherited, like retinitis pigmentosa, require specialized treatment. The Eye Doctor performs a full set of tests, including blood work, before recommending supplements. 

This way, you get appropriate treatment for your condition rather than supplements that are unnecessary or ineffective.

​