anterior chamber -Answer space in front of the eye, bounded in front by the cornea and
behind by the iris; filled with aqueous humor
antibody -Answer a specific substance produced by the body in the presence of an antigen
antigen -Answer any substance that acts against the action of histamine
aphakia -Answer absence of the crystalline lens of the eye
aqueous humor -Answer clear, watery fluid that fills the anterior and posterior chambers
within the front part of the eye
arcus senilus -Answer grayish white ring in the periphery of the cornea
asthenopia -Answer eye fatigue caused by tiring of the internal and/or external muscles
astigmatism -Answer a refractive error that prevents light rays from coming to a single
focus
on the retina because of different degrees of refraction in the various meridians of the eye
against-the-rule astigmatism -Answer condition in which the steepest corneal meridian is
in
the horizontal plane. An example of keratometer readings for a patient exhibiting this
condition
,would be:
K's 45.00@180/42.00@90
irregular astigmatism -Answer astigmatism caused by an irregularly shaped cornea
lenticular astigmatism -Answer astigmatism found in the crystalline lens
oblique astigmatism -Answer regular astigmatism in which the principal meridians are
other
than 90 & 180
residual astigmatism -Answer astigmatism remaining after the corneal astigmatism has
been
neutralized
with-the-rule astigmatism -Answer condition in which the steepest corneal meridian is in
the
vertical plane, an example of keratometer reading for a patient exhibiting this condition
would
be:
K's: 42.00@180/45.00@90
atrophy -Answer wasting or decrease of tissue due to faulty nutrition or loss of verve
supply
, back vertex power (BVP) -Answer when neutralizing a lens, the concave or the posterior
side
of the lens in placed against the aperture of the lensometer
bedewing (Cornea) -Answer an edematous condition of the epithelium of the cornea
characterized by irregular reflecting from a multitude of droplets when the cornea is viewed
with the slit lamp
biconcave lens -Answer lens having a concave surface on both faces
biconvex lens -Answer lens having a convex surface on both faces
binocular vision -Answer ability to use the two eyes simultaneously to focus on the same
object and to fuse the two images into a single image that gives a correct interpretation of its
solidity and its position in space
blepharitis -Answer inflammation of the margins of the eyelids
blepharoconjunctivitis -Answer inflammation of the eyelids and conjunctiva
blepharoplasty -Answer plastic surgery of the eyelid
base curve -Answer refers to the radius of curvature of the central posterior surface of the
lens. It may be expressed in diopters of surface power (D) or in millimeters (mm) of radius or
curvature.