
1) Vision defect 2) Visual defect 3) Visual disorder 4) Visual impairment
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https://www.crosswordclues.com/clue/scotoma

A scotoma (Greek σκότος/skótos, darkness; plural: scotomas or scotomata) is an area of partial alteration in the field of vision consisting of a partially diminished or entirely degenerated visual acuity that is surrounded by a field of normal – or relatively well-preserved – vision. Every normal mammalian eye has a scotoma in its field...
Found on
http://en.wikipedia.org/wiki/Scotoma

An area of partial or complete blindness, surrounded by normal visual field
Found on
http://eyediologyopticians.co.uk/pages/Eye-terms-explained.html

dizziness with headache and impairment of vision
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http://phrontistery.info/s.html

Area of diminished or lost vision within the visual field, surrounded by an area of less affected or normal vision.
Found on
http://sis.nlm.nih.gov/enviro/iupacglossary/glossarys.html

• (n.) Scotomy.
Found on
http://thinkexist.com/dictionary/meaning/scotoma/

(Gr. skotoma) 1. an area of lost or depressed vision within the visual field, surrounded by an area of less depressed or of normal vision. 2. mental s.
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http://users.ugent.be/~rvdstich/eugloss/DIC/dictio79.html

An area of decreased vision surrounded by an area of less depressed or normal vision.
Found on
http://www.aans.org/Media/Glossary-of-Terminology

(from the article `visual field defect`) a blind spot (scotoma) or blind area within the normal field of one or both eyes. In most cases the blind spots or areas are persistent, but in some ...
Found on
http://www.britannica.com/eb/a-z/s/49

1. An area of lost or depressed vision within the visual field, surrounded by an area of less depressed or of normal vision. ... 2. Mental scotoma ... Origin: Gr. Skotoma ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973

(sko-to´mә) an area of lost or depressed vision within the visual field, surrounded by an area of less depressed or of normal vision. mental scotoma. adj., scotom´atous., adj.
Found on
http://www.encyclo.co.uk/local/21001

A blind spot in the visual field which may be natural (each eye has a blind spot) or due to disease of the visual system (can be in the eye or the brain â€` the visual image is received by the eye but we “seeâ€? with our brains) - Disturbance of vision causing dizziness
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http://www.encyclo.co.uk/visitor-contributions.php
Sco·to'ma noun [ Latin ]
(Medicine) Scotomy.
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http://www.encyclo.co.uk/webster/S/36

Type: Term Pronunciation: skō-tō′mă, skō-tō′mă-tă Definitions: 1. An isolated area of varying size and shape, within the visual field, in which vision is absent or depressed. 2. A blind spot in psychological awareness.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=80345

A localized, disease-caused "blind spot" in the retina.
Found on
http://www.thehorse.com/Glossary.xhtml?L=S

scotoma (s), scotomata (pl) 1. An area of lost or depressed vision within the visual field, surrounded by an area of less depressed or of normal vision. 2. Loss of vision in a part of the visual field; a blind spot. 3. A permanent or temporary area of diminished sight in the field of vision.
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http://www.wordinfo.info/words/index/info/view_unit/1464/
noun an isolated area of diminished vision within the visual field
Found on
https://www.encyclo.co.uk/local/20974

A visual disorder wherein there is complete or partial loss of vision in an area of the eye, which is surrounded by an area wherein there is normal vision.
Found on
https://www.encyclo.co.uk/local/22233

an area of partial or complete loss of vision surrounded by an area of normal vision.
Found on
https://www.stanfordchildrens.org/en/topic/default?id=pediatric-glossary---
No exact match found.