From HPO
Night blindness- MedGen UID:
- 10349
- •Concept ID:
- C0028077
- •
- Disease or Syndrome
Inability to see well at night or in poor light.
Central scotoma- MedGen UID:
- 57750
- •Concept ID:
- C0152191
- •
- Finding
An area of depressed vision located at the point of fixation and that interferes with central vision.
Color vision defect- MedGen UID:
- 115964
- •Concept ID:
- C0234629
- •
- Finding
An anomaly in the ability to discriminate between or recognize colors.
Reduced visual acuity- MedGen UID:
- 65889
- •Concept ID:
- C0234632
- •
- Finding
Diminished clarity of vision.
Constriction of peripheral visual field- MedGen UID:
- 68613
- •Concept ID:
- C0235095
- •
- Finding
An absolute or relative decrease in retinal sensitivity extending from edge (periphery) of the visual field in a concentric pattern. The visual field is the area that is perceived simultaneously by a fixating eye.
Peripheral visual field loss- MedGen UID:
- 116124
- •Concept ID:
- C0241688
- •
- Finding
Loss of peripheral vision with retention of central vision, resulting in a constricted circular tunnel-like field of vision.
Metamorphopsia- MedGen UID:
- 75739
- •Concept ID:
- C0271185
- •
- Sign or Symptom
A visual anomaly in which images appear distorted. A grid of straight lines appears wavy and parts of the grid may appear blank.
Blindness- MedGen UID:
- 99138
- •Concept ID:
- C0456909
- •
- Disease or Syndrome
Blindness is the condition of lacking visual perception defined as a profound reduction in visual perception. On the 6m visual acuity scale, blindness is defined as less than 3/60. On the 20ft visual acuity scale, blindness is defined as less than 20/400. On the decimal visual acuity scale, blindness is defined as less than 0.05. Blindness is typically characterized by a visual field of no greater than 10 degrees in radius around central fixation.
Abnormal electroretinogram- MedGen UID:
- 96908
- •Concept ID:
- C0476397
- •
- Finding
Any abnormality of the electrical responses of various cell types in the retina as measured by electroretinography.
Macular hyperpigmentation- MedGen UID:
- 488933
- •Concept ID:
- C0745109
- •
- Finding
Increased amount of pigmentation in the macula lutea.
Bone spicule pigmentation of the retina- MedGen UID:
- 323029
- •Concept ID:
- C1836926
- •
- Finding
Pigment migration into the retina in a bone-spicule configuration (resembling the nucleated cells within the lacuna of bone).
Retinal pigment epithelial atrophy- MedGen UID:
- 333564
- •Concept ID:
- C1840457
- •
- Finding
Atrophy (loss or wasting) of the retinal pigment epithelium observed on fundoscopy or fundus imaging.
Chorioretinal atrophy- MedGen UID:
- 884881
- •Concept ID:
- C4048273
- •
- Disease or Syndrome
Atrophy of the choroid and retinal layers of the fundus.
Cone-rod dystrophy- MedGen UID:
- 896366
- •Concept ID:
- C4085590
- •
- Disease or Syndrome
The first signs and symptoms of cone-rod dystrophy, which often occur in childhood, are usually decreased sharpness of vision (visual acuity) and increased sensitivity to light (photophobia). These features are typically followed by impaired color vision (dyschromatopsia), blind spots (scotomas) in the center of the visual field, and partial side (peripheral) vision loss. Over time, affected individuals develop night blindness and a worsening of their peripheral vision, which can limit independent mobility. Decreasing visual acuity makes reading increasingly difficult and most affected individuals are legally blind by mid-adulthood. As the condition progresses, individuals may develop involuntary eye movements (nystagmus).\n\nThere are more than 30 types of cone-rod dystrophy, which are distinguished by their genetic cause and their pattern of inheritance: autosomal recessive, autosomal dominant, and X-linked. Additionally, cone-rod dystrophy can occur alone without any other signs and symptoms or it can occur as part of a syndrome that affects multiple parts of the body.\n\nCone-rod dystrophy is a group of related eye disorders that causes vision loss, which becomes more severe over time. These disorders affect the retina, which is the layer of light-sensitive tissue at the back of the eye. In people with cone-rod dystrophy, vision loss occurs as the light-sensing cells of the retina gradually deteriorate.