Page 48 - The UK Guide to Laser Eye Surgery
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48 Questions about technology
 Tonometry
How does it benefit you?
The inside of the eye is nourished by the production of fluid, which drains out of the eye; if there is an imbalance between the rate at which the fluid is produced and the rate at which it is drained away, the intraocular pressure may increase or decrease from its normal level. Measuring changes to the IOP is important, as these changes can affect other structures in the eye such as the optic nerve. Increased pressure inside the eye is often associated with glaucoma. Glaucoma is a treatable condition but, if left untreated, it can be devastating - which is why early diagnosis is so important.
Night vision simulation
What is it for?
Measuring your night vision disturbances. This test provides your surgeon with a picture of how your vision is affected by glare at night, so that they can design a customised treatment plan to maintain or enhance your night vision after surgery.
What actually happens?
The optometrist asks you to look at a computer simulation of common night vision disturbances, such as halos and ‘starbursts’ around light-emitting objects (e.g. oncoming car headlamps and street lights). They then vary the size and brightness of these disturbances to try to simulate how you see at night.
How does it feel?
You feel nothing.
How does it benefit you?
This test provides your surgeon with subjective feedback which they then match with the objective measurements that have been taken of your wavefront, refraction and topography, allowing them to custom design the optimal treatment for you.
                  





















































































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