Hemianopsia是一只眼睛或两只眼睛的视野的一半视野的丧失。常见原因是：

  • stroke
  • 脑tumor
  • trauma to the brain

通常，大脑的左半部分从双眼的右侧接收视觉信息，反之亦然。

Some information from your视神经crosses to the other half of the brain using an X-shaped structure called theoptic chiasm。When any part of this system is damaged, the result can be partial or complete loss of vision in the visual field.

当受到损害时，可能会出现偏头痛：

  • 视神经
  • optic chiasm
  • visual processing regions of the脑

The most common causes of brain damage that can result in hemianopsia are:

较少情况下，脑损伤也可能是：

使用偏头痛，您只能看到每只眼睛的视野的一部分。偏头痛是由视觉场缺失的部分进行分类的：

  • bitemporal:outer half of each visual field
  • homonymous:每个视野的相同一半
  • right homonymous:right half of each visual field
  • left homonymous:left half of each visual field
  • 优越的：每个视野的上半
  • 下：lower half of each visual field

Symptoms can be easily confused with those of other disorders, especially in cases of partial hemianopsia. If you suspect you may have hemianopsia, see your healthcare provider. If hemianopsia occurs quickly or suddenly, seek medical attention immediately.

Symptoms may include:

  • sensation that something is wrong with your vision
  • bumping into objects while walking, especially door frames and people
  • 驾驶困难，尤其是在更换车道或避开道路侧面的物体时
  • 经常在阅读时失去您的位置，或者找不到文本行的开始或结尾
  • difficulty finding or reaching for objects on desks or countertops or in cabinets and closets

Hemianopsia can be detected by a视野测试。您将重点放在屏幕上的单个点上，而灯光在上面，下方，左侧以及该焦点中心的右侧。

通过确定您可以看到哪个灯，测试映射了已损坏的视野的特定部分。

如果视觉场的一部分受损，则MRI scanis often suggested. The scan can show whether there’s brain damage to the areas of the brain responsible for vision.

您的医生将开处方治疗，以解决导致您的偏腹性疾病的疾病。在某些情况下，随着时间的流逝，偏腹性可能会有所改善。在发生脑损伤的地方，通常是永久性的，但可以通过一些疗法来帮助。

The degree of function that can be restored depends on the cause and severity of the damage.

Vision restoration therapy (VRT)

VRT works by repeatedly stimulating the edges of the missing field of vision. The adult brain has some ability to rewire itself. VRT causes your brain to grow new connections around the damaged areas to restore lost functions.

已经发现它可以恢复5 degrees某些人的视野失落。

视野扩张器辅助

每个镜头都可以为您安装特殊的眼镜。这些棱镜弯曲传入的光，使其到达视野的未破坏段。

Scanning therapy (saccadic eye movement training)

扫描疗法教会您养成动眼的习惯，以查看通常看不到的视野部分。转动头还可以扩大您的视野。

By developing this habit, you’ll eventually learn to always look with the visual field that’s still intact.

阅读策略

A number of strategies can make reading less challenging. You can look for long words to use as reference points. A ruler or sticky note can mark the beginning or end of the text. Some people also benefit by turning their text sideways.

生活方式改变

如果您有偏见，进行一些生活方式的改变可能会有所帮助：

  • 与另一个人同行时，将该人放在受影响的一边。在那里有一个人将阻止您撞到视野之外的物体。
  • In a movie theater, sit toward the affected side, so that the screen is largely on your unaffected side. This will maximize the amount of the screen that you can see.
  • 驾驶能力的因素而异。驾驶模拟器或与医疗保健提供者进行咨询可以帮助您确定安全。