
Over-Minused Glasses: Warning Signs and the Red–Green Test
Over-minused glasses look razor sharp yet cause strain and headaches — young myopes are the usual victims. The warning signs and the red–green test.
The right glasses start with an accurate eye exam, lenses matched to your needs, and frames that fit your face. Kinh Mat Dien Bien Phu helps you move step by step.
The right glasses start with an accurate eye exam, lenses matched to your needs, and frames that fit your face. Kinh Mat Dien Bien Phu helps you move step by step.
Updates on glasses, eye care, and modern lens technology.

Over-minused glasses look razor sharp yet cause strain and headaches — young myopes are the usual victims. The warning signs and the red–green test.
Eye healthGlasses match your prescription but you still get eye strain and dizziness? The 6 real causes: off-center PD, a wrong astigmatism axis, over-minus, unbalanced eyes — and how to self-check before re-measuring.
Eye healthYour near addition (ADD) can't be looked up by age and simply added on: accommodation reserve and working distance differ for everyone. How ADD is properly measured — and why too much is worse than too little.
Eye healthAn astigmatism axis off by just 5–10° is enough to cause distorted images, tilted floors, and dizziness when turning your head. Why the axis is so sensitive, where the error comes from, and how to check it.
Eye healthWhy does a thorough eye exam take 20–30 minutes instead of a 2-minute machine reading? We decode the standard 20-step protocol on the NIDEK RT-6100 phoropter: what each step does, and why it exists.
Eye healthAn accurate prescription only gets you halfway. Monocular PD, vertex distance, fitting height, and frame tilt decide the other half of a pair of glasses that wears comfortably.
Eye health"Clearer with 1 or 2?" repeated a dozen times isn't a hesitant technician — it's the Jackson Cross Cylinder fine-tuning your astigmatism axis. Here's how it works and how to answer.
Eye healthEye check-up and lens change schedule for students before the school year starts: signs of increasing prescription, safe lenses, scratch-resistant, and screen work — suggestions in Ho Chi Minh City.
Eye healthNon-prescription blue light filtering glasses: who should consider them, marketing limits on 'blue light blocking', and when to get an eye exam instead of buying — avoid unnecessary dependency on non-prescription glasses.
Eye healthExplanation of monovision in glasses: mechanism, advantages and disadvantages, adaptation, and driving notes; does not replace an eye exam — prescribed by an ophthalmologist / refractionist.
Eye health6 signs that indicate you need new glasses: scratched lenses, loose frames, blurry vision... A guide to the right time to replace your glasses.
Eye healthSudden blurry vision can be a sign of a serious condition. Learn about the causes and when to seek immediate eye care.
Eye healthLearn about school myopia: common causes in students, how to recognize it, and effective preventive measures for children.
Eye healthChildren with myopia: signs to recognize, how to handle it, should children wear glasses early? Expert advice for parents.
Eye healthA guide to the proper screen viewing distance for computers, phones, and TVs. Sitting posture and tips to reduce eye strain for office workers.
Eye healthAnswering a common question: does wearing glasses for myopia increase prescription? The real reasons why myopia increases and how to prevent it.
Eye healthRecognize 7 signs that indicate your eyes need an eye exam immediately: squinting, headaches, blurred vision far/near... Don't be complacent about your eyesight!
Eye healthHigher order aberrations (HOA) are more sophisticated and complex refractive errors compared to myopia, hyperopia, and astigmatism. Due to their complex nature, these aberrations...
Eye healthMyopia is a refractive error that causes distant objects to appear blurry. It is the most common cause of vision impairment in people under 40 years old. Myopia often begins...
Eye healthAstigmatism is not a disease; it is simply a type of refractive error or vision condition that causes blurred, fuzzy, or distorted vision. Astigmatism is...
Eye healthIn daily life, many people use the term “hyperopia” to refer to general issues with distance vision. From an ophthalmological perspective, hyperopia...
Eye healthClear vision is not just about myopia/astigmatism but also a combination of viewing habits, lighting environment, and regular check-ups. At **Kính Mắt Điện Biên Phủ** (529 3/2 Street, Ho Chi Minh City), we often advise customers in a practical way: doing a few small things correctly each day will reduce eye strain, limit errors when making glasses, and help you feel the difference when wearing the right lenses.
Eye healthDo you have 20/20 vision while wearing glasses but still feel dissatisfied with your view? You may benefit from high-definition lenses. Sometimes, aberrations...