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Abstract

IMPACT OF MYOPIC AND HYPEROPIC ANISOMETROPIA ON STEREOPSIS AND CONTRAST SENSITIVITY

Fauzia Jamil, Dr. Abdullah Naeem, Prof. Dr. Sohail Ahmad, Saif Ullah, Memona

Asghar and Sadaf Qayyum*

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Abstract

Background: Anisometropia is a common condition that leads to that visual problem including ARC (abnormal retinal correspondence), aniseikonia, suppression, strabismus and most importantly amblyopia. Aniseikonia causes disturbance in the fusion of two images of both eyes. Due to these problems stereopsis as well as contrast sensitivity is disturbed. Objective: The objectives of the study were to assess the level of stereopsis and contrast sensitivity in myopic and hyperopic anisometropia and also to compare the stereopsis and contrast sensitivity in myopic and hyperopic anisometropia. Materials and methodology: A crosssectional study was carried out in the general OPD of Al-Shifa Trust Eye Hospital, Rawalpindi from July 2021 to December 2021. A study was conducted on 60 patients having anisometropia (myopic and hyperopic anisometropia) up to 2D or greater than 2D to evaluate its effect on stereopsis by using Titmus fly stereo test and contrast sensitivity by using the Mars contrast sensitivity chart. To achieve the objective of the study, data was collected from patients through a structured proforma after taking informed consent. CS was measured by using a Mars Contrast Sensitivity chart. Stereopsis was measured by using a Titmus fly stereo test. Result: A total of sixty anisometropic patients were enrolled in this study, out of which 50% were myopic anisometropic and 50% were hyperopic anisometropic. Mean Stereopsis in myopic anisometropic patients was found to be 916.6±1173.5 and in hyperopic anisometropic were 460±700. The mean CS of myopic anisometropia in RE was 1.40±0.308 and in LE was 1.44±0.32. The mean CS of hyperopic anisometropia in RE was 1.51±0.21 and in LE was 1.53±0.18. There was no statistically significant difference in stereopsis and CS was found in myopic and hyperopic anisometropia with p>0.05. Conclusion: There was no statistically significant difference in Stereopsis and Contrast Sensitivity found in myopic and hyperopic anisometropia. CS and stereopsis were affected equally in both types of anisometropia.

Keywords: Impact, Myopia, Hyperopia, Anisometropia, Stereopsis, Contrast Sensitivity.


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