Text-book of ophthalmology . ss of cornea a1 base Diameter of cornea (diameter of anterior chamber) Depth of anterior chamber Thickness of lens (eye not accommodating) Thickness of lens (eye accommodating) [Fig. 2.—D.] OBJECTIVE EXAMINATION OF THE EYES 77 The anteroposterior diameter of the eye is usually greater in myopes and lessin hyperopes than that above given (see §§ 771 and 782). In the newborn infant the antero-posterior diameter of the eye varies from and the vertical diameter from to mm. The eye grows rapidlyduring the first few years of
Text-book of ophthalmology . ss of cornea a1 base Diameter of cornea (diameter of anterior chamber) Depth of anterior chamber Thickness of lens (eye not accommodating) Thickness of lens (eye accommodating) [Fig. 2.—D.] OBJECTIVE EXAMINATION OF THE EYES 77 The anteroposterior diameter of the eye is usually greater in myopes and lessin hyperopes than that above given (see §§ 771 and 782). In the newborn infant the antero-posterior diameter of the eye varies from and the vertical diameter from to mm. The eye grows rapidlyduring the first few years of life, the vertical diameter growing faster, so that the eyebecomes now more nearly spherical (Weiss). The center of rotation of the eye is mm. back of the apex of the cornea(Helmholtz).—D.] 75. The conjunctiva of the lids can be brought into view by everting thelatter. With the lower lid, it is sufficient for this purpose simply to drawit down, while the patient is told at the same time to look up. [If in pulling. [Fig. 3.—Bergers Binocular Loupe with Electric Attachment.— the lid down we make slight pressure against it below with a somewhat roll-ing movement, so as to revolve the lid forward, not only will the lid itself beeverted, but the retrotarsal fold will spring up and come into view.—D.] With the upper lid, eversion requires a certain degree of skill, whichmust be obtained by practice. It is the more important to acquire thisfacility, since it is just the conjunctiva of the upper lid that generally affordsthe best evidence for the diagnosis of conjunctival diseases: the thickeningof the conjunctiva, the uneven surface, the formation of cicatrices, whichare characteristic of trachoma, are here most easily to be perceived. Further,the eversion of the upper lid is very frequently necessary for the removal offoreign bodies. [To evert the upper lid we direct the patient to look down,grasp the lashes between the thumb and finger, and draw the lid down and
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