The Oculus Keratograph 5M – Corneal mapping, tear film analysis and meibography

We are the first practice in Scotland and amongst the first in the UK to offer the Oculus Keratograph K5.  The Keratograph 5M technology is a revolution in corneal topography and dry eye analysis.

Advanced Corneal Topography

Advanced corneal topography allows us to diagnose and monitor abnormalities and pathologies of the cornea such as Keratoconus.  We are also able to create bespoke and fully customised contact lenses enabling us to successfully fit individuals who have previously failed with standard contact lenses.  Corneal Topography allows bespoke lens designs for vision correction methods such as orthokeratology and myopia control.


Contact Lens Fitting

Complex contact lens fitting of conditions such as high astigmatism, high myopia or keratoconus can be a complicated, time consuming and expensive process.  The Oculus K5 is changing how we fit contact lenses.  Contact lenses are recommended on an individual basis and may require a customised made-to-measure design.  Fluorescein image simulation can help us avoid superfluous steps in fitting contact lenses.  The contact lens can be rotated and moved around, changes to the design made and tracked automatically by the simulation. The integrated and expandable database contains all customary types of contact lenses and is updated on a regular basis.   Meaning we can fit and compare different lens designs before selecting, ordering and manufacturing the perfect lens for you, saving both time and money.

Oculus OxiMap®

The cornea needs oxygen, and a good oxygen supply is therefore fundamental for the comfort of contact lens wearers.  New materials used for soft contact lenses offer excellent oxygen transmissibility. We can now measure the amount of oxygen soft contact lenses would offer your eyes to ensure you are wearing the most suitable and comfortable contact lens available.

How much oxygen really reaches the cornea?

Until now, oxygen transmissibility values could only be given in reference to the centre of a -3.00D contact lens – OxiMap® shows oxygen transmissibility as a function of lens material and lens thickness. OxiMap® is available for the most frequently sold spherical soft contact lenses. This convenient tool assists us in selecting the best lens for you and your lifestyle.

Contact lenses act as a potential barrier to oxygen transport even when the eyes are open. Long hours of wearing comfort can only be guaranteed with a sufficient oxygen supply.  OxiMap® shows the oxygen transmissibility of contact lenses on a colour scale to depict the international recommendations for daily, extended and continuous wear.



Tear Analysis

The Oculus K5 evaluates the tear film with the aid of white and infrared illumination.  The new high definition colour camera makes the finest structures visible.  NIKBUT (non-invasive Keratograph break-up time) allows for assessment of the quality of the tears important in the diagnosis of evaporative dry eye.  Tear meniscus height measurement evaluates tear volume, useful in aqeous deficiency dry eye.  Imaging of the lipid layer and tear film particle movement allow assessment of tear viscosity.  All of these exams are non-invasive and reproducible allowing for better understanding, diagnosis and treatment of dry eye.


Tear meniscus height – Evaluation of tear film quantity.

With an integrated measuring guide and various magnification tools we can measure tear meniscus height and evaluate its characteristics along the lower lid margin. We can then track improvements in tear volume during your dry eye treatment plan.


Lipid Layer – Evaluation of lipid layer thickness

The colour and structure of the lipid layer are visualised and can be recorded. Measurements are taken of lipid layer thickness, which correlates with tear film evaporation and dry eye symptoms. If the lipid layer is too thin or absent, the tear evaporation rate and tear film instability increase.


TF dynamics – Evaluating the particle flow characteristics

A video recording with up to 32 images per second, permits observation of tear film particle flow characteristics and shows tear film viscosity.


Meibography – Meibo-Scan

The new Keratograph 5M is a multi-purpose diagnostic device that easily and efficiently integrates complex examinations such as meibography into ophthalmological and optometric practices.

Dry eye is most commonly caused by meibomian gland dysfunction (MGD). Meibo-Scan reveals morphological changes in the glandular tissue.  The ability to assess and grade the quality of meibomian glands allows us to specifically target and treat dry eye with more accuracy.


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