Understanding the Tear Film
The lacrimal apparatus
THE LACRIMAL APPARATUS AND PRECORNEAL TEAR FILM Introduction Throughout the Middle Ages, tears were thought to be waste products of the brain. It was not until about 50 years ago that...
The lacrimal apparatus
THE LACRIMAL APPARATUS AND PRECORNEAL TEAR FILM Introduction Throughout the Middle Ages, tears were thought to be waste products of the brain. It was not until about 50 years ago that...
The secretory system
The secretory system produces a sufficient quantity and quality of tear film to allow the ocular surface to function normally. A smooth refractive surface, ocular comfort and the health of the cornea...
The secretory system
The secretory system produces a sufficient quantity and quality of tear film to allow the ocular surface to function normally. A smooth refractive surface, ocular comfort and the health of the cornea...
The distribution system
The distribution system consists of the eyelids and the tear meniscus along the lid margins in the open eye. Irregularities or disorders of the eyelids can interfere with lid function, resulting in...
The distribution system
The distribution system consists of the eyelids and the tear meniscus along the lid margins in the open eye. Irregularities or disorders of the eyelids can interfere with lid function, resulting in...
The excretory system
The excretory system is made up of the lacrimal puncta, the lacrimal canals, the lacrimal sac, the nasolacrimal duct and the nasal cavity. It is estimated that under normal conditions, over 90%...
The excretory system
The excretory system is made up of the lacrimal puncta, the lacrimal canals, the lacrimal sac, the nasolacrimal duct and the nasal cavity. It is estimated that under normal conditions, over 90%...
The precorneal tear film
The tear film is in direct contact with the conjunctiva and cornea. It is the second line of ocular surface defence, after the lids. This thin layer (approximately 7 mm) protects, nourishes...
The precorneal tear film
The tear film is in direct contact with the conjunctiva and cornea. It is the second line of ocular surface defence, after the lids. This thin layer (approximately 7 mm) protects, nourishes...
The epithelial surface
Many of the important functions of the corneal epithelium are influenced by the substances in the precorneal tear film. The main functions of the epithelial surface are to: block the passage...
The epithelial surface
Many of the important functions of the corneal epithelium are influenced by the substances in the precorneal tear film. The main functions of the epithelial surface are to: block the passage...