loading...| Preferred Name | Blindness | |
| Synonyms |
Legal blindness Total vision loss Blindness |
|
| Definitions |
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. Various scales have been developed to describe the extent of vision loss and define blindness. Total blindness is the complete lack of form and visual light perception and is clinically recorded as NLP (no light perception). Blindness is frequently used to describe severe visual impairment with residual vision. Those described as having only light perception have no more sight than the ability to tell light from dark and the general direction of a light source. |
|
| ID |
http://purl.obolibrary.org/obo/HP_0000618 |
|
| comment |
Various scales have been developed to describe the extent of vision loss and define blindness. Total blindness is the complete lack of form and visual light perception and is clinically recorded as NLP (no light perception). Blindness is frequently used to describe severe visual impairment with residual vision. Those described as having only light perception have no more sight than the ability to tell light from dark and the general direction of a light source. |
|
| database_cross_reference |
SNOMEDCT_US:65956007 UMLS:C0456909 UMLS:C0271215 Fyler:4866 |
|
| definition |
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. |
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| has_alternative_id |
HP:0007839 |
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| has_exact_synonym |
Total vision loss Blindness |
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| has_related_synonym |
Legal blindness |
|
| id |
HP:0000618 |
|
| in_subset | ||
| label |
Blindness |
|
| notation |
HP:0000618 |
|
| preferred label |
Blindness |
|
| prefLabel |
Blindness |
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| subClassOf |