Have you thoughtfully considered about
your Night Vision after surgery?
see well as day time. Many people suffer at night due to glare, halos and starburst.
If you don’t know this fact, it is easy to consider day vision only.
Nowadays people are also very active at night. Some jobs require to have good night
vision. As a fact refractive surgery need to consider not only day vision, but also night vision.
The difference between day and night vision
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1
During the day, pupil size is small and needs a small surface of cornea to pass the light. The central corneal thickness and surface state can influence day vision.
During the night, pupil size gets larger and ne-ed a larger surface of cornea to pass the light. Centering and larger zone of cornea thickness affects the night vision.
Cornea outer center of large zone can affect the night vision.
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2
Day and night light wavelength is different. At night, light’s refractive index makes wavelength increase and the focal point of light is in front of the retina which cause myopia. With astigmatism, the light’s refraction increases and worsen night vision.
At night, light’s refractive index cause myopia and astigmatism are worst.
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3
Since our eyes are aspherical, light is curved toward peripheral rather than at the center therefore image is created in front of the retina. Big night pupil increases high order aberration, therefore image created in front of the retina and cause night myopia. Bigger the night pupil effect the high order aberration and increase the night myopia. To avoid night myopia, laser ablation zone needs to be not only at the center but wider to peripheral surface.
At night, high order aberration increases and worsen night myopia.
Candidate
- Vision decrease at night
- Have night glare
- Have double vision
- Feels discomfort at night
- Feels even more discomfort at night after Lasik/Lasek surgery
Various factors must be considered for clear night like daytime.
For best result, corrected visual acuity, ablation amount,
laser zone and etc decisions must be made with no errors.
There are 12 differences in DREAM Good Night Vision.
These factors made possible to have best quality night vision.
1. The examination is different.
DREAM's safe 100 Good Night Vision examination is
to provide comfortable
and clear night vision and
to secure safety for risk of large amount of
ablation
to provide precise refractive eye surgery.
Day and Night. Surgery considers the
difference between day and night pupil size.
Everyone has a different size of shoes same with pupils. At night, the pupil even gets bigger and difference are greater. Iris controls the amount of light that enters the eye through the pupil. As age, the flexibility of iris decrease and also pupil size. DREAM's Good Night Vision surgery will also consider the night pupil size for quality night vision.
Considering night vision, operation zone is wide as possible with in safe limit.
Corneal ablation area and amount is different. and night pupil size.
To remain larger amount of corneal thickness, it means smaller laser zone. It results in bad night vision. The Korean Ophthalmological Society recommends to remain 250㎛ of cornea thickness after the surgery. If the all the criteria meets and the cornea is healthy, it is wise to have a larger zone for better night vision than remain larger amount of cornea thickness.
Two equipments for safety
-
1.
CT, Pentacam, Tomey Oculus tests to check even up to cell level for safety limit.
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2.
Xtra is to help achieve more stable, enhance stronger cornea after surgery.
7 steps of considerations
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1.
Cornea health
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2.
Day and night pupil size
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3.
Different pupil size between day and night
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4.
Use of eye circumstance
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5.
patient needs
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6.
patient age
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7.
Myopia, hyperopia, and astigmatism
Precise correction of cornea shape.
For quality night vision, center and wide laser ablation zone of cornea must be even and smooth. Astigmatism correction needs to be accurate. By cowave system, uneven cornea shape can be fixed evenly and smoothly therefore day and night vision clear.
No neglected of the cornea transitional zone.
The irregular surface difference between laser ablation and non laser ablation zone cause scatter light due to curved light at the boundary area. Amaris Red Smart Pulse Technology will make the transitional zone smooth to reduce the night glare, but increase the preciseness of vision.
Precise ablation zone at the center. (Centering)
If the laser was not ablated at the center, the light will scatter through non cover ablation zone. This is will cause glare and worsen night vision. With Amaris Red, 7 dimension eye tracking system, laser ablation is done accurately the center. Clear night and day vision is possible through precise centering.
Considering personal needs and eye environment for surgery.
Everyone has a different needs and in different environment. It is important to know the condition of the eye. 20’s and 40’s eyes are different, and some are active more at night especially for driving. At Dream, we persist personal needs and understand the usage of eye for the best result. Starting with thorough examination like pupil size, cornea health, surgery surface and personal needs are considered for surgery.
20 years of surgical experience and excellent skill doctors operate surgery.
4 eye specialist with 20 years of experienced operates surgery in Dream Eye Center. More than 30,000 cases of surgical experience and 1st generation surgeons of who started Lasik in Korea. Through many experienced, accurate monogram is obtain and operated without surgical errors.
Latest and best laser machine.
1050(per-second)Hz is currently the fastest and highest excimer laser with smallest beam size (0.54mm) Smart Pulse Technology (SPT)improves vision quality in the early postoperative surgery by smoothing the cornea surface to prevent night glare, light sensitive and irritation.
The pain level is significantly reduced after Lasek surgery.
Pain control technique reduced pain level significantly into 1~2 days rather than 2~3 days after Lasek surgery without pain medication. Recovery period is comfortable. Over 70% of patients were very satisfied with Less Pain Lasek.
Fast and stable recovery after Lasek surgery.
Lasek surgery has many advantage but people are afraid due to pain and slow recovery. During re-growing of epithelium membrane, can feel pain and vision is unstable. PRP (blood serum) will help speed up the recovery process and stabilize your vision.
How to prevent complications and life long guarantee and the primary care system.
Dream has a special care program to prevent complications and fast recovery.
