from Section 5 - Medical and Surgical Emergencies During Pregnancy
Published online by Cambridge University Press: 06 May 2021
The tear film consists of three layers: the outer lipid layer, the middle aqueous layer and the inner mucin layer. The stability of the tear film is dependent on all three layers functioning in an optimal, synergistic manner. The lipid layer is secreted by the Meibomian glands and the aqueous and the mucin layers by the lacrimal glands and goblet cells, respectively.
In pregnancy, the tear film becomes unstable and alters in composition, causing it to break up quickly, resulting in irritation and discomfort to the patient (Figure 25.1). It is important to examine the eye under a slit lamp and exclude any other lid or corneal pathology, which could be contributing to these ocular symptoms.
To save this book to your Kindle, first ensure [email protected] is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.