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Leukocoria (also white pupillary reflex) is an abnormal white reflection from the retina of the eye. Leukocoria resembles eyeshine , but leukocoria can also occur in animals that lack eyeshine because their retina lacks a tapetum lucidum .
Coats' disease is a rare congenital, nonhereditary eye disorder, causing full or partial blindness, characterized by abnormal development of blood vessels behind the retina. Coats' disease can also fall under glaucoma. It can have a similar presentation to that of retinoblastoma. [1]
Norrie disease is a rare X-linked recessive genetic disorder that primarily affects the eyes and almost always leads to blindness.It is caused by mutations in the Norrin cystine knot growth factor gene, also referred to as Norrie Disease Pseudoglioma (NDP) gene.
Stage-crisis view is a theory of adult development that was established by Daniel Levinson. [1] [2] Although largely influenced by the work of Erik Erikson, [3] Levinson sought to create a broader theory that would encompass all aspects of adult development as opposed to just the psychosocial.
Daniel J. Levinson (May 28, 1920 – April 12, 1994), a psychologist, was one of the founders of the field of positive adult development.Levinson is most well known for his theory of stage-crisis view, however he also made major contributions to the fields of behavioral, social, and developmental psychology.
Adult development encompasses the changes that occur in biological and psychological domains of human life from the end of adolescence until the end of one's life. Changes occur at the cellular level and are partially explained by biological theories of adult development and aging. [ 1 ]
In biology, a biological life cycle (or just life cycle when the biological context is clear) is a series of stages of the life of an organism, that begins as a zygote, often in an egg, and concludes as an adult that reproduces, producing an offspring in the form of a new zygote which then itself goes through the same series of stages, the ...
Development before birth, or prenatal development (from Latin natalis 'relating to birth') is the process in which a zygote, and later an embryo, and then a fetus develops during gestation. Prenatal development starts with fertilization and the formation of the zygote , the first stage in embryonic development which continues in fetal ...