Biometry-2 | Measurement of Axial length | Smart Optometry
HTML-код
- Опубликовано: 11 сен 2024
- AXIAL LENGTH: Axial length is the distance between anterior and posterior pole of eyeball
At birth 17 mm
In adult 24 mm
In myopia more than 24 mm
In hyperopia less than 24 mm
METHODS: There are two methods
A. Ultrasonic
B. Optical
ULTRASONIC METHOD:
i. It contain a 10MHz solid probe with inbuilt fixation
ii. It has to be aligned with optical axis of the eye for accurate measurement
iii. This can be done in two technique :
A. Immersion technique
B. Contact technique
1. IMMERSION TECHNIQUE:
--------Patient lie in supine position looking a fixation at the ceiling
--------A scleral shell is applied to the eye filled with 1% OR 2% Methylcellulose
--------Probe is Immersed in the solution keeping 5-10 mm away from the cornea
--------Probe is gently moved intil properly aligned with optical axis
--------Echo spike will displayed in the monitor.
ECHO SPIKES ARE:-
--- IS = INITIAL SPIKE PRODUCED BY PROBE
--- C1 = ANTERIOR CORNEAL SPIKE
--- C2 = POSTERIOR CORNEAL SPIKE
--- L1 = ANTERIOR LENS SPIKE
--- L2 = POSTERIOR LENS SPIKE
--- R = RETINAL SPIKE
--- S = SCLERAL SPIKE
--- O = ORBITAL SPIKE
2. CONTACT TECHNIQUE:
i. Alternative to immersion technique doesn’t use scleral shell
ii. Probe directly contact with cornea
iii. These can be done in two methods:
1. Hand held
2. Attaching with slit lamp or applanation tonometer
PROCEDURE:
------ Patients seated after applying local anesthetic drop
------ Asked to fixed a target straight with non-testing eye
------ Probe is properly aligned along with visual axis & brought forward to touch the cornea
------ Five spike will be displayed on the screen.
ECHO SPIKES ARE:
--- C = POSTERIOR COrNEAL SPIKE
--- A = ANTERIOR LENS SPIKE
--- P = POSTERIOR LENS SPIKE
--- R = RETINAL SPIKE
--- S = SCLERAL SPIKE
B.. OPTICAL TECHNIQUE:
i. Use partial coherence laser
ii. Biometer measure the time required for infrared light to travel to retina
iii. This technique doesn’t have contact with cornea, so corneal compression
artifacts are eliminated.
FOR DETAILS NOTE;
VISIT OUR WEBSITE: www.smartopto....
--------------------------------------------------------------------------------------------------------------------
Binocular Subjective Refraction:
Part-1: • Binocular Subjective r...
Part-2: • Septum Method - Turvil...
Part -3: • Polarization Method - ...
Part -4: • Fogging Method - Binoc...
Part-5: • Steps of Binocular Sub...
Biometry:
Part-1: • Introduction Of Biomet...
Paet-2: • Biometry-2 | Measureme...
Part-3 • Biometry-3 | Measureme...
Optical Coherence Topography:
Full: • Optical Coherence Tomo...
Part-1: • Optical Coherence Tomo...
Part-2: • Optical Coherence Tomo...
Dry Eye:
Part-1: • Dry Eye - Introduction...
Part -2: • Dry Eye - Classificati...
Part -3: • Dry Eye - Clinical Fea...
Part -4: • Dry Eye - Treatment (w...
Part -5: • Tear Film Break-up Tim...
Part- 6: • Schirmer test - Dry Ey...
Full: • Dry Eye - Full Tutorial
Myopia
Part-1: • Myopia - Introduction ...
Part-2: / dvrkegdkxq
Part-3: • Myopia - Clinical Pict...
Part -4: • Myopia - Ocular examin...
Part -5: • Myopia - Management or...
I work in industry. You’d be surprised how little we are taught. Thank you for the information.
Stay with us and share with your friends.
Thank you,
Team Smart Optometry.
Hlo sir most helpful video
Very nice..
Very nice 👍🏻
Good review.
Stay with us and share with your friends.
Thank you,
Team Smart Optometry.
well explained
Stay with us and share with your friends.
Thank you,
Team Smart Optometry.
Thank you
Thank you.
Stay with us and share with your friends.
Don't forget to download our app "Optometry Notes & MCQs". It's available in Google Play Store.
Thank You,
Samir Sutradhar.
Thanks
Welcome.....
Kaun sa lence hota hai
Sir biometry Shi hai ya galat h
Your voice volume it not clear
Yeah, U r Right.
In Recent videos we have solved this problem. Please use earphone for this video
Suggest us, if you think anything needs to change..
Stay with "Smart Optometry"
Kese Pta kre
In Optical Biometric Accuracy scale is there.
In A scan Biometry You have see the spike, variation in reading etc...
Sound must be improved,very low
Yeah...
Currently we improved sound quality and graphics.
Check our recent videos....
Please sir Urdu and Hindi mai banaya
We will try to prepare videos on Hindi.
Thank you,
Team Smart Optometry.
Sir please Hindi mai video banay