[Optic nerve disc in unilateral myopia in children]

Area of Science:

• Ophthalmology
• Pediatric Optometry
• Biomorphometry

Background:

• Myopic anisometropia in children presents unique challenges in differentiating structural changes from pathological conditions like glaucoma.
• Understanding the biomorphometric parameters of the optic nerve head (ONH) is crucial for accurate diagnosis and monitoring in pediatric eye care.

Purpose of the Study:

• To evaluate the biomorphometric parameters of the optic nerve head in children with myopic anisometropia.
• To determine if glaucoma-like changes, as described in adults, are present in the optic nerve heads of these children.

Main Methods:

• A cohort of 17 children (7-18 years) with unilateral myopia underwent examination using a laser scanning ophthalmoscope.
• Biomorphometric parameters including total contour area (TCA), cup/disc ratio (C/D), and cup volume were measured in both myopic and fellow emmetropic eyes.
• Statistical analysis was performed to compare parameters between the myopic (Group I) and emmetropic (Group II) eyes.

Main Results:

• Myopic eyes exhibited significantly longer axial lengths compared to emmetropic eyes.
• While total contour area (TCA) showed no significant difference, the mean cup/disc ratio (C/D) and cup volume were significantly smaller in myopic eyes than in emmetropic eyes.
• These findings suggest distinct structural characteristics in the optic nerve heads of myopic children.

Conclusions:

• Optic nerve disc morphology in pediatric myopic eyes differs from that in glaucomatous eyes.
• The observed smaller optic disc cup in myopic children suggests eyeball enlargement without associated nerve fiber atrophy.
• This distinction is vital for avoiding misdiagnosis of glaucoma in pediatric myopia.