Diagnosis
Night blindness is detected by the ophthalmologist (specialist in ophthalmology) using tests. First and foremost, however, discussions between doctor and patient are informative. Devices like the nyctometer or mesoptometer are used.
These measure the twilight visual acuity. They test the performance of the visual organ between daytime vision and complete adaptation to darkness. Patients are first exposed to very bright light, after which they are moved to as dark a room as possible. After a familiarization period of about 15 minutes, different visual signs are presented to the patient under different lighting conditions.
Therapy
Congenital night blindness is not treatable. It is inherited and progresses steadily. According to studies, the progression of so-called retinopathy pigmentosa can be slightly slowed down by the administration of vitamin A.
Furthermore, attention should be paid to other eye diseases. Perhaps additionally a cataract (grey cataract) is present, which worsens the visual ability in addition. If an acquired night blindness is present, vitamin A can also be substituted. As a general rule, it should be noted that patients should not drive a car at dusk.
Prognosis
Night blindness cannot be prevented, since in most cases it is a congenital disease. However, a balanced diet should always be followed to prevent the development of night blindness. Vitamin A or its precursors are contained in the following foods, among others:
- Carrots
- Liver
- Egg Yolk
- Butter.
