Correlation Between Corneal Topographic Patterns and Refractive Status Of The Eye in Sohag City,Egypt

Study Overview
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Brief Summary
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To evaluate corneal topographic pattern & its correlation with refractive status of the eye .

Detailed Description
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This study will be established in The Future Center for refractive surgery, Sohag, Egypt. This study will include 100 eyes of patients aged over 15 years. All patients were subjected to topography imaging. Using Oculus Pentacam® which is s a rotating Scheimpflug camera. The rotational measuring procedure generates Scheimpflug images in three dimensions. The scheimpflug principle describes the optical imaging condition when the plane of an object is not parallel to the film of the camera and has to cut each other in one line or one point of intersection with the advantage to achieve wide depth of focus. Scheimpflug imaging attains a wide and high depth-of-focus , providing sharp images that include information from an anterior corneal surface through to the posterior crystalline capsule; this depends mainly on media transparency and pupil size .

Official Title
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Correlation Between Corneal Topographic Patterns and Refractive Status Of The Eye in Sohag City,Egypt

Conditions
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Eye Change

Intervention / Treatment
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* Diagnostic Test: Using Oculus Pentacam® which is s a rotating Scheimpflug camera. The rotational measuring procedure generates Scheimpflug images in three dimensions.


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients aging more than 15 years old All patients are with visual acuity (uncorrected, with habitual correction, and best spectacle correction). There is no restrictions on the range and regularity of keratometry. Exclusion Criteria: Patients with a history of any trauma to the eye. Patients with recent contact lens wear. history of ocular surgery . Patients with distance corrected visual acuity or abnormal retinoscopy examination (e.g., scissoring reflex). 5. If there was any error in reading the topographic map. 6. Patients with anemotropic refraction.

Ages Eligible for Study
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Minimum Age: 15 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: group Low Myopia<br>Patients with low myopia aging more than 15 years old All patients are with visual acuity (uncorrected, with habitual correction, and best spectacle correction). There is no restrictions on the range and regularity of keratometry | Diagnostic Test: Using Oculus Pentacam® which is s a rotating Scheimpflug camera. The rotational measuring procedure generates Scheimpflug images in three dimensions.<br>* Scheimpflug imaging attains a wide and high depth-of-focus , providing sharp images that include information from an anterior corneal surface through to the posterior crystalline capsule<br>* Other names: The scheimpflug principle describes the optical imaging condition;|
| Experimental: group high myopia<br>Patients with high myopia aging more than 15 years old All patients are with visual acuity (uncorrected, with habitual correction, and best spectacle correction). There is no restrictions on the range and regularity of keratometry | Diagnostic Test: Using Oculus Pentacam® which is s a rotating Scheimpflug camera. The rotational measuring procedure generates Scheimpflug images in three dimensions.<br>* Scheimpflug imaging attains a wide and high depth-of-focus , providing sharp images that include information from an anterior corneal surface through to the posterior crystalline capsule<br>* Other names: The scheimpflug principle describes the optical imaging condition;|
| Experimental: group Hypermetropia<br>Patients with hypermetropia aging more than 15 years old All patients are with visual acuity (uncorrected, with habitual correction, and best spectacle correction). There is no restrictions on the range and regularity of keratometry | Diagnostic Test: Using Oculus Pentacam® which is s a rotating Scheimpflug camera. The rotational measuring procedure generates Scheimpflug images in three dimensions.<br>* Scheimpflug imaging attains a wide and high depth-of-focus , providing sharp images that include information from an anterior corneal surface through to the posterior crystalline capsule<br>* Other names: The scheimpflug principle describes the optical imaging condition;|
| Experimental: group mixed astigmatism<br>Patients with mixed astigmatism aging more than 15 years old All patients are with visual acuity (uncorrected, with habitual correction, and best spectacle correction). There is no restrictions on the range and regularity of keratometry | Diagnostic Test: Using Oculus Pentacam® which is s a rotating Scheimpflug camera. The rotational measuring procedure generates Scheimpflug images in three dimensions.<br>* Scheimpflug imaging attains a wide and high depth-of-focus , providing sharp images that include information from an anterior corneal surface through to the posterior crystalline capsule<br>* Other names: The scheimpflug principle describes the optical imaging condition;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Thickness | Topographic values using Oculus Pentacam® | 3 months after begin of study | 
| degree of astigmatism in D | Topographic values using Oculus Pentacam® | 3 months after begin of study | 
| maximum keratometry | Topographic values using Oculus Pentacam® | 3 months after begin of study | 
| front and back elevation of the apex (um). | Topographic values using Oculus Pentacam® | 3 months after begin of study | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Topographic, visual acuity