- 1 What is night vision?
- 2 Common problems of night blindness or nyctalopia
- 3 Diseases that cause poor night vision
- 4 5 Tips to improve night vision
- 5 How to evaluate night vision?
Vision nOctoberurn is possible thanks to the visual system's ability to correctly focus images in poorly lit spaces. When we are in a dark environment, pupils of the eyes are dilated so that more light enters the ocular structure.
Over the years, night vision can become poor and make it difficult to perform everyday tasks such as reading, driving, and even walking. When it worsens, it is important to go to the ophthalmologist to examine the eyes and rule out some eye disorders.
Do you have difficulty seeing well at night? In Área Oftalmológica Avanzada we share with you 5 tips to improve night vision
What is night vision?
Night vision is the ability of the eye to see correctly in the dark. This is different from the daytime in the measure that the pupils are dilated so that the photoreceptor cells of the retina catch what little light there is.
During the elderly it is common for night vision to begin to be poor. This may be due to a condition called nyctalopia or night blindness and is usually caused by a dietary deficiency, degeneration of the macula and / or the Cataracts.
Common problems of night blindness or nyctalopia
When a person has deficiency in their night vision, they usually manifest the following problems or limitations:
- Difficulty see nearby objects.
- The brightness of the car lights or headlights at night it can further interfere with the correct viewing of images.
- Blurred vision en dimly lit spaces.
- Difficulty read and drive.
- Sparkles or halos de luz around the lighting points.
Diseases that cause poor night vision
Night blindness can also be a problem that is related to a variety of eye conditions. Let us know below the main causes of poor night vision:
The Cataracts are the opacity of crystalline, the natural lens of the eye, which causes blurred vision of images at any distance. Patients with CataractsThey often have trouble seeing well at night and driving. They may also see halos of light or flashes around car headlights or street lights.
El glaucoma It is a set of disorders that affect the proper functioning of the optic nerve. Remember that this is responsible for sending nerve signals to the brain to transform them into images. In addition, it affects peripheral and central vision, so it also works by reducing night vision.
La taint it is located in the center of the retina and is shaped like a very small yellow spot. This is responsible for the perception of details. Patients with macular degeneration may have blind spots in vision during the day and at night.
Diseases that affect the functioning of the retina, such as retinitis pigmentosa, usually present vision problems in dimly lit spaces. This is because there are fewer photoreceptor cells in the retina and these are found on the edge of the retina, right where tissue deterioration usually begins.
Vitamin A deficiency
Many times night vision problems can be caused by a deficiency of vitamin A. When there is a deficit of this nutrient in the body, rhodopsin production is reduced, the pigment that the rod cells of the retina need to capture light in dark spaces.
Congenital night blindness
Some congenital diseases can directly affect night vision, causing its deficiency or blocking it completely.
La refractive surgery is a surgical technique that allows us mold the shape of the cornea to correct vision defects. Changes to the cornea after this procedure can affect the way light is reflected and cause light halos or flashes in the eye. campor visual overnight.
5 Tips to improve night vision
Here are some tips that can be of great help to combat or improve night vision:
Wear red glasses
Before going out to a poorly lit place, wear red glasses so that your eyes get used to the darkness. This avoid halos of light or glare that can be presented in the campor visual and thus improve night vision.
Don't look straight into the light
When looking directly at the light, the pupils contract. This fact increases the time required for the pupils to dilate and to have correct night vision. For this reason, drivers are advised not looking directly or staring at the lights of other cars when driving at night.
Adapt your eyes to the dark
Before going out at night, turn off all the lights in your room and stay in the dark for 30 minutes. This helps your eyes get used to the absence of light naturally and adapt faster to night vision when you leave the house.
Keep your eyes moving
Keeping your eyes fixed on illuminated objects such as computer screens, tablets or mobile phones can cause the reflection of light to dazzle you and contract your pupils. To avoid this, we advise you blink frequently and keep your eyes moving.
Massage your eyes
With your eyes closed, exercise a slight pressure on your Eyelids with the palm of your hands for 10 seconds. Then wait 5 seconds and open them again. You will see that your night vision improves temporarily.
How to evaluate night vision?
En Área Oftalmológica Avanzada we have a program to assess night vision. To perform the test, you need software and a device called a halometer.
The study is conducted in a dimly lit room and consists of send light stimuli to the patient's eyes in different positions, in order to study how ocular structures react, specifically the retina.
Every time the patient detects a stimulus, you need to press a button for the software to recognize it and can detect the parameter called visual impairment index. The higher this index, the greater the nocturnal visual disturbance.
En Área Oftalmológica Avanzada We have the best experts and the necessary technology to perform a complete eye examination. If you want to know how to improve your night vision, do not hesitate to make an appointment with us and we will assist you in the best way. We will wait for you!