A dilated segment of the nasal duct and narrows into the nasolacrimal duct, which empties into the inferior meatus of the nose
An instrinsic muscle consists of unstriped fibers form a grayish, semitransparent, circular band approximately 1/8 inch wide on the outer surface of the forward part of the choroid
Ciliary body alters the shape of the crystalline lens during _____, which is the ability to focus
Regulates the amount of light entering eye through pupil. The pupil allows for the transmission of light. Making the ____an instrinsic muscle.
Anterior caviy is fille with _________, which helps to give the cornea its curved shape.
Is larger than the anterior cavity, occupies all of the space posteriority to the lens, and contains vitreous humor helps maintain sufficient pressure inside the eye to prevent the eyeball from collapsing.
Eye injuries that leave a dense white scar on the cornea, severe corneal infection that leads to corneal scarring (Keratoconus), corneal dysrophies, inherited disease of the cornea, and cataract or other eye surgery can prompt corneal clouding, these causes are conditions of ______
Clouding of the cornea
An inflammation of the lacrial sace, is often caused by an obstruction of the nasolacrimal duct
Is a misalignment or deviation of the eyes that normally work simultaneouslyto track visual objects. For both eyes to be synchronized in their movements and positions. They require about the same vision and accommodative (focusing) ability.
Is a small lump on the inner or outer surface of the eyelid. It is caused by an inflammatory reaction to material trapped inside an oil secreting gland (meibomian gland) in the eyelid
Balanced salt solution
Available on the sterile field
all the the above are samples of
Heating of body tissue for the purpose of coagulation or destruction with the use of radiation, electric current, and ultrasonic waves
A cutting instrument used to make a circular cut, used during Keratoplasty to size the donor cornea and to remove the recipient cornea
Generally more effective when performed on the vertically acting muscles
Is a deviation of the position of the eye and the inability to direct both eyes on the same object
Commonly used for retinal detachments especially when there are no complicating factors
Perfomed to establish a new pathway for tear drainage from the lacrimal sac to the middle meatus of the nose
There are two types of strabismus correction, what are they_____. Which has the greater effect on the lateral rectus?____
Resection and Recession:
Reasons to performing an ________, it is indicated for excision of an eye due to malignant neoplask, penetrating wounds, or if the eye has been so extensively damged that no vision can be regained.
Are based during enucleation to provide a base of support for the artificial eye; spherical implants remain in use but in many instances they are being replaced by the hydroxyapatite implants; hydroxyapatite is a complex calcium phosphate and a naturally occurring body substance; this form of hydroxyapatite has a microstructure similar to cancellous bone with interconnecting channels.
Hydroxyapatite (ocular implants)
Cornea is the anterior window to the eye it allows light into the eye and bends (refracts) the light rays to help the lens focus them upon the retina. Surgery to correct a cloudy cornea
Keratoplasty (corneal transplant)
Two methods cataract extraction are:
Intracapsular: involves a large incision. The lens is picked up for extraction with forceps, suction, or a cryoprobe. The ENTIRE capsule is removed.
Extracapsular: performed through a small incision and the lens is expressed or removed manually or by phacoemulsification. The phacoemulsification method uses ultrasonic energy to break up the lens: the lens material is irrigated and aspirated simultaneously. The posterior capsule remains. During this surgery, a superior rectus bridal suture is placed for manipulation and stabilization of the globe. An incision is made, either corneoscleral or corneal, which is self-sealing.
A microsurgical procedure in which specialized microinstruments and techniques are used to repair retinal disorders. Requires the use of an ocutome, an instrustment with which vitreous is cut and aspirated; variable cut and aspiration rates are controlled from the main pane