Understanding Dark Adaptation: Factors Affecting Eye Adjustment Time
Dark adaptation ability 1. Does the ability to adapt to darkness vary in time depending on the light source the eyes are exposed to? 2. Is there a difference in adaptation time when returning home from bright sunlight to a dark room compared to returning home at night to a dark r...
Dr. Gao Pilin Reply:
Hello, Ms. Wang: 1. It will be different. 2. It will be different. 3. It should be a normal phenomenon. 4. It is likely caused by the light source; the adaptation time will be longer when transitioning from a brighter environment to a darker one.[Read More] Understanding Dark Adaptation: Factors Affecting Eye Adjustment Time
Is It Normal to See Only Outlines in the Dark? Understanding Night Blindness
Night vision Is it normal to see only a faint outline of objects for 1.2 minutes after the lights are turned off, and for them to gradually become clearer after 3.4 minutes? Could this be considered an early stage of night blindness?
Dr. Gao Pilin Reply:
Hello, Ms. Hsiao: This should still be within the normal range and is not night blindness.[Read More] Is It Normal to See Only Outlines in the Dark? Understanding Night Blindness
Understanding Night Blindness: Early Symptoms and Adaptation
Symptoms of night blindness? I would like to ask the doctor, once night blindness begins to appear: 1. What are the initial symptoms? 2. If night blindness has just started, will I be completely unable to see at night when going out? Or will my ability to adapt to the dark take l...
Dr. Gao Pilin Reply:
Hello, Miss Wang: 1. In the early stages, there is a decline in dark adaptation ability. For example, if you used to be able to see the outlines of objects in the dark within five minutes, now it takes longer than five minutes to see clearly. 2. Going out at night should still be...[Read More] Understanding Night Blindness: Early Symptoms and Adaptation
Impact of Smartphone Use on Night Vision Adaptation: Myths and Facts
Mobile phone. Night blindness? 1. If a doctor continuously looks at their phone and then immediately turns off the lights, will the time taken to adapt to the darkness be longer than usual? 2. If someone has been looking at their phone, with their eyes constantly exposed to a l...
Dr. Gao Pilin Reply:
Hello, Miss Lin: 1. Yes, because the mobile phone acts as a light source, if the screen is very bright, this situation can occur. 2. It may not be the case. The principle is as mentioned above.[Read More] Impact of Smartphone Use on Night Vision Adaptation: Myths and Facts
Understanding Night Blindness: Causes and Solutions for Eye Fatigue
Night blindness issue Yesterday, I spent 1.2 hours on the computer for a course, during which I already felt eye fatigue and a headache. After turning off the computer and immediately going to sleep in the dark, I noticed that while I usually take just 1 minute to adjust to the d...
Dr. Gao Pilin Reply:
Hello Ms. Chen: 1. Night blindness does not occur suddenly and does not resolve on its own. If there is an improvement later, it is likely not night blindness. 2. If the vision returns after resting, it may be due to retinal fatigue caused by prolonged computer use. 3. If this ph...[Read More] Understanding Night Blindness: Causes and Solutions for Eye Fatigue
Understanding Night Vision Issues: Causes and Solutions for Blurred Vision
Vision problems Hello Doctor, recently when I am outside at night, I feel that the halos around streetlights are very pronounced, and buildings appear darker and less clear than before (it gets better when I block the streetlight). When I ride my bike at night, everything seems n...
Dr. Gao Pilin Reply:
Hello: Based on your description and the doctor's examination, it should not be night blindness. Astigmatism can affect night vision, so you might want to try wearing glasses to see if it improves. Of course, eye strain can also have an impact. Take more breaks and see if it...[Read More] Understanding Night Vision Issues: Causes and Solutions for Blurred Vision
Understanding Eye Symptoms: Flashes, Floaters, and Vision Concerns
Blinking and shadow issues? Hello Doctor, I am a student who has asked questions before. Recently, my eye condition has not improved and seems to be gradually worsening, which is making me very anxious. I would like to inquire about my situation. Last year, I developed floaters, ...
Dr. Gao Pilin Reply:
Hello, anxious college student: 1. First, it's important to know that if your retina has been examined and found to be normal, there is no need to worry about floaters. Therefore, your concern is unfounded, and you do not need to feel anxious. Occasional floaters are not i...[Read More] Understanding Eye Symptoms: Flashes, Floaters, and Vision Concerns
Understanding Eye Health: Addressing Floaters, Flashes, and Dim Vision
Regarding issues with the retina, experiencing flashes of light, and feeling that indoor environments are relatively dim? Hello Doctor: I am 33 years old, and my current vision is 1175 in the left eye and 1200 in the right eye, both with astigmatism of 100. I have a regular habit...
Dr. Gao Pilin Reply:
Hello: If you have already undergone an eye examination and there are no issues, there is no need to feel anxious. Psychological anxiety can lead to other problems. Your sleeping position does not have a significant impact. The frequency of examinations should follow the recommen...[Read More] Understanding Eye Health: Addressing Floaters, Flashes, and Dim Vision
Understanding Night Vision Issues: Night Blindness or Astigmatism?
Viewing signs at night? Hello Doctor, recently I have noticed that I have difficulty seeing the letters on signs at night (for example, yellow letters on a dark green background). It feels like the glare from streetlights is affecting my vision. Could this be night blindness, or ...
Dr. Gao Pilin Reply:
Hello Wei: Based on your description, it seems to be caused by astigmatism and should not be related to night blindness. If you experience some blurriness in your vision when transitioning from lying down to standing up, it may be related to blood pressure. I recommend that you s...[Read More] Understanding Night Vision Issues: Night Blindness or Astigmatism?
Is a 25-50 Degree Increase in Myopia Normal for Adults?
Increase in prescription strength? This year, at 21 years old, I went for an eye exam and found that my left eye increased by 50 diopters and my right eye increased by 25 diopters. 1. Is it considered normal for an adult to have an increase of 25 and 50 diopters in one year? 2...
Dr. Gao Pilin Reply:
Hello Ms. Lin: A difference of below 50 degrees is quite common; measurements taken in the morning and afternoon may show such discrepancies. Each machine may also have its own margin of error. Therefore, the degree may not necessarily increase.[Read More] Is a 25-50 Degree Increase in Myopia Normal for Adults?
Understanding Night Vision Issues: Black Shadows and Eye Discomfort
There are dark shadows in the center of my vision at night? Hello, doctor. Recently, after turning off the lights at night, I have noticed a dark shadow in the center of my vision (right eye, -500 diopters of myopia). The color tone of my vision becomes darker, but my field of vi...
Dr. Gao Pilin Reply:
Hello, this is not night blindness. The principle is likely similar to the phenomenon of seeing shadows after light is shone into the eyes. The occurrence of flashes may be due to photopsia or afterimages, which are physiological phenomena. Information found online should only be...[Read More] Understanding Night Vision Issues: Black Shadows and Eye Discomfort
Understanding Night Blindness and Floaters: Key Insights for Eye Health
Night blindness and floaters? Hello, Doctor. I would like to inquire about night blindness and floaters. 1. When I walk from a well-lit room to a completely dark living room (with only slight light coming through the window), it is completely dark at first, but after taking a f...
Dr. Gao Pilin Reply:
Hello: 1. Is it true that a retinal electroretinogram (ERG) is needed to diagnose night blindness? Based on your situation, if you can see within a few seconds, similar to a normal person, then it is likely not night blindness, as individuals with night blindness typically cann...[Read More] Understanding Night Blindness and Floaters: Key Insights for Eye Health
Understanding Night Vision Issues: Congenital vs. Acquired Night Blindness
Night vision problems Hello, doctor. I would like to inquire about my situation. When I come home at night without turning on the lights, I can see clearly in the living room (which has windows for natural light), but the hallway (which only has light coming from other rooms) is ...
Dr. Gao Pilin Reply:
Hello Wei: Is it true that a retinal electroretinogram test is needed to diagnose night blindness? Based on your situation, it seems that you may be able to see normally after some time, and typically, individuals with night blindness would not be able to see at all. Therefore, i...[Read More] Understanding Night Vision Issues: Congenital vs. Acquired Night Blindness
Is Difficulty Reading in Low Light Normal or a Sign of Night Blindness?
Insufficient light for reading? Is it normal to have difficulty reading in low light, or could this be a symptom of night blindness? Thank you, doctor. Additionally, I would like to ask if it is possible to see anything in complete darkness or total absence of light?
Dr. Gao Pilin Reply:
Hello Chen Chen: It is natural to find it difficult to read in low light, but if you can see in the dark while others cannot, it may indicate a problem with your night vision. The eyes require light to see; typically, in darkness, you can perceive some light due to low illuminati...[Read More] Is Difficulty Reading in Low Light Normal or a Sign of Night Blindness?
Understanding ERG Abnormalities in Patients with Low Vision (0.1-0.3)
ERG waveforms and amplitude abnormalities with visual acuity of 0.1-0.3? Hello Doctor: My current vision is approximately 0.1-0.3. I have undergone fundus photography, intraocular pressure measurement, slit lamp examination, ERG, VF, VEP, corneal mapping, and brain MRI, which con...
Dr. Gao Pilin Reply:
Hello Mr. Tsai: The interpretation of ERG (electroretinography) requires a highly specialized retinal physician for accurate diagnosis. I apologize for not being able to provide you with a definitive answer. My recommendation is to consult with a retinal specialist who can explai...[Read More] Understanding ERG Abnormalities in Patients with Low Vision (0.1-0.3)
Understanding Night Blindness: Symptoms and Diagnosis Explained
Inquiry about night blindness? Hello, doctor. I would like to inquire whether not being able to see anything in a completely dark room could be a sign of night blindness. Recently, I've noticed that I have difficulty reading signs at night, and I'm unsure if this is rel...
Dr. Gao Pilin Reply:
Hello Wei: If you find it difficult to read the signs outside at night, it may be related to your prescription. Try wearing glasses to see if it improves your clarity; if it does, then there is likely no issue, and it should not be night blindness. After examination, everything a...[Read More] Understanding Night Blindness: Symptoms and Diagnosis Explained
Understanding Night Blindness: Common Questions and Clarifications
The definition of night blindness? 1. In a completely dark room with no light, it is not possible to see anything, including the general shapes of objects. Vision requires light to reflect off objects and reach the retina. Night blindness, or nyctalopia, is defined as difficulty ...
Dr. Gao Pilin Reply:
Hello, Ms. Wang: "Dark adaptation time" is determined by the rod cells; "poor dark adaptation" refers to an extended adaptation time in lower light conditions, to the point where one cannot see their hand in front of them, leading to what is known as "nig...[Read More] Understanding Night Blindness: Common Questions and Clarifications
Understanding Blurred Vision and Abnormal ERG Results: Causes and Treatments
Blurred vision with abnormal ERG? Hello, doctor. My current vision is approximately 0.3S1200 c400. I have undergone OCT, VF, VEP, ERG, FAF, and corneal mapping. It has been confirmed that there is no color blindness or night blindness. Currently, it seems that only the amplitude ...
Dr. He Jianxian Reply:
Dear Mr. Andy: If there are functional abnormalities in the retina, there are very few means to improve the condition. As of now, I am unable to provide effective treatment recommendations. This is for your reference. If you have any other questions, I suggest discussing them w...[Read More] Understanding Blurred Vision and Abnormal ERG Results: Causes and Treatments
Understanding Night Blindness: Why Do I See Better in Dim Light?
Is this night blindness? Does anyone know why when the lighting is dim at night, I can't see anything when looking directly at objects, but I can see them using peripheral vision? This issue has been bothering me for a long time, and I've consulted a doctor. The doctor ...
Dr. Cai Wenyuan Reply:
It is recommended to visit a medical center for an examination, which should provide the answers needed.[Read More] Understanding Night Blindness: Why Do I See Better in Dim Light?
Understanding Night Blindness: When Darkness Affects Your Vision
It's hard to see things in a dark room? Hello Doctor, I would like to ask if being unable to see well in a mostly dark place (with only a small amount of light coming through a crack in the door) after five minutes could indicate night blindness. I can make out the general s...
Dr. Gao Pilin Reply:
Hello Wei: If you are experiencing night blindness, you can visit a retinal specialist for an examination to confirm the condition. They can assess whether the function of the rod cells is normal. In Taiwan, the Department of Ophthalmology at Puzi Hospital is available on Monday,...[Read More] Understanding Night Blindness: When Darkness Affects Your Vision