Also found in: Dictionary, Thesaurus, Acronyms.
Related to nanophthalmos: Microphthalmos
abnormal smallness in all dimensions of one or both eyes in the absence of other ocular defects; see microphthalmos.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
Abnormal smallness of the eye.
[micro + G. ophthalmos, eye]
Farlex Partner Medical Dictionary © Farlex 2012
microphthalmiaA congenital reduction in eye size, with the ocular bulb measuring 1/2 of the normal volume in extreme cases, due to an abnormal development of the optic vesicle in the optic cup.
• Congenital—e.g., encephalo-ophthalmic dysplasia, focal dermal hypoplasia, Hallermann-Streiff syndrome, incontinentia pigmenti, Lenz microphthalmia syndrome, retinopathy of prematurity, trisomy 13-15.
• Infectious—e.g., CMV, herpes, rubella, toxoplasmosis.
• Toxins—e.g., foetal alcohol syndrome.
14/105; 3–11% of all cases of blindness.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
Congenital anomaly in which the eyeball is abnormally small and often deeply set in a small orbit. It is typically hyperopic. Syn. microphthalmos; microphthalmus. When there is no other abnormality (e.g. coloboma of the iris, microphthalmos with cyst), the condition is called nanophthalmos (Fig. M10). See anophthalmia; monophthalmia; pseudoptosis.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann