Night Blindness (Nyctalopia)

 Night Blindness (Nyctalopia)


Night blindness is a condition where a person has difficulty seeing in low light or darkness. It is not a disease by itself, but a symptom of an underlying eye problem.


✅ Causes of Night Blindness


1. Vitamin A deficiency – Most common cause in developing countries.



2. Retinitis pigmentosa – A genetic disorder damaging the retina.



3. Cataracts – Clouding of the eye’s lens reduces light entry.



4. Glaucoma medications – Some reduce pupil size, affecting night vision.



5. Myopia (Nearsightedness) – Can worsen night vision.



6. Diabetes – Diabetic retinopathy may affect vision in low light.



7. Keratoconus – Irregular cornea can scatter light poorly.


🔍 Symptoms

  • Difficulty seeing in dim light or darkness

  • Trouble driving at night

  • Slow adjustment to darkness after bright light

  • Blurry or poor peripheral vision in low light


🧪 Diagnosis


An eye doctor may perform:


  • Visual acuity test


  • Retinal examination


  • Electroretinogram (ERG)


  • Blood tests (to check for vitamin A levels or genetic causes)


💊 Treatment


Depends on the underlying cause:


  • Vitamin A supplements for deficiency


  • Surgery for cataracts


  • Glasses or contact lenses for refractive errors


  • Managing diabetes or changing medications


  • No cure for genetic causes, but low vision aids can help


🌟 Prevention


  • Eat a balanced diet rich in Vitamin A (carrots, spinach, sweet potatoes, liver)


  • Regular eye check-ups


  • Control diabetes and other chronic diseases

For further process click https://medorbis.ai

Comments

Post a Comment

Popular posts from this blog

MYOPIA

What is Myopia? Myopia (commonly called nearsightedness) is a vision condition where a person can see nearby objects clearly but distant objects appear blurry. What Causes Myopia? It usually occurs when: The eyeball is too long from front to back. The cornea (the clear front surface of the eye) is too curved. As a result, light rays focus in front of the retina, instead of directly on it. Symptoms of Myopia: Blurred vision when looking at distant objects. Squinting to see clearly. Eye strain or headaches (especially after focusing on distant objects). Difficulty seeing while driving, especially at night (night myopia). Risk Factors: Genetics : If one or both parents are myopic, the risk increases. Excessive near work : Prolonged reading, computer, or phone use. Lack of outdoor time: Spending less time in natural light, especially in childhood. Treatment and Management Corrective Lenses: Eyeglasses or contact lenses with minus (–) power lenses. Refractive Surgery: LASIK, PRK, SMILE – re...
Read more

Important of colour check

  Why is it important to check colour vision? Checking colour vision is important for several reasons: 1. Early Detection of Vision Disorders It helps detect congenital colour blindness, especially in children. Can also reveal acquired conditions due to eye diseases (e.g., glaucoma, optic neuritis). 2. Career Requirement Certain professions require normal colour vision, such as: Pilots Electricians Military personnel Police officers Graphic designers Drivers Railway and maritime workers 3. Safety and Daily Functioning Correct colour recognition is vital for identifying traffic lights, warning signs, and colour-coded materials. Difficulty distinguishing colours can impact school performance, cooking, clothing choices, and reading charts or graphs. 4. Monitoring Disease Progression Colour vision testing helps track changes in patients with: Diabetic retinopathy Multiple sclerosis Macular degeneration Medication side effects (e.g., ethambutol) 5. Educational Guidance In children, dete...
Read more