The key facts

  • Symptoms resembling cataracts may indicate pathology of the optic nerve or the brain
  • If the problem is not in the eye, a routine fundus examination may not reveal it — an MRI and a neurologist are needed
  • With a sharp deterioration in vision, a haze, or a missing section of the image, the doctor advises seeking help immediately

Similar symptoms — different causes

Symptoms resembling cataracts sometimes indicate not problems within the eye itself, but issues with the brain or the optic nerve. Gazeta.Ru was told about this by Aigul Otkhozoria, an ophthalmologist at the Moscow clinic 3Z. According to her, visual acuity depends not only on the eye: the image is transmitted from the retina along the optic nerve to the brain, and a failure can occur at any point along this pathway.

Why a routine examination may reveal nothing

The doctor explained that at an early stage some changes are not always detectable during a routine fundus examination, because there is no problem in the eye itself. In such cases, the patient needs an MRI and a consultation with a neurologist. One example is optic nerve pathology: inflammation or damage to the nerve degrades the quality of the transmitted image and is often accompanied not only by blurred vision but also by pain when moving the eyes, as well as impaired color perception.

When waiting for a routine appointment is not an option

Otkhozoria emphasized: if vision has deteriorated sharply, a white haze, a dark spot, or a 'missing' section of the image has suddenly appeared, one should not postpone a visit to the doctor — medical help should be sought as soon as possible. The practical significance of this explanation is that the habitual interpretation of 'fog before the eyes' as a purely ocular problem can delay the diagnosis of a condition that requires a neurological workup. Earlier, as the outlet notes, the doctor spoke about what flashes and spots before the eyes indicate; the content of that material is not included in the publication.