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MTTC Visually Impaired (061) Practice Tests & Test Prep by Exam Edge

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MTTC Visually Impaired Sample Test

1 of 5

The eyelids cover developing orb and fuse in a fetus ___ weeks after conception?

Correct Answer:

10.
the correct answer to the question "the eyelids cover the developing orb and fuse in a fetus ___ weeks after conception?" is 10 weeks.

at around 8 weeks gestation, significant developments occur in the visual system of a fetus, including the extension of optic nerve fibers to the brain. this marks an important step in the neurological connections that will allow for vision. as the fetus progresses to 9 weeks, the cornea, which is the transparent front part of the eye covering the iris and pupil, begins to form. this development is crucial for protecting the eye and aiding in focusing light that enters the eye.

by 10 weeks gestation, the eyelids have developed sufficiently to cover the eyeball completely and subsequently fuse. this temporary fusion of the eyelids serves as a protective measure, shielding the developing eyes from amniotic fluid and aiding in proper development of the cornea and other ocular structures. the eyelids remain fused until around the 26th week, after which they start to separate, preparing the eyes for functionality after birth.

further developments in the eye continue from 12 to 14 weeks gestation, where the glands within the eyelids that are responsible for tear production begin to form. additionally, the ocular muscles, which are essential for controlling eye movements, start to develop during this period. the formation of the vitreous body, a gel-like substance that fills the space between the lens and the retina of the eye, also occurs around this time, contributing to the overall structure and function of the eye. understanding these stages of ocular development is crucial in assessing the normal growth of a fetus and can aid in the early detection of potential issues that might require intervention.