Near work induces myopia in Guinea pigs

Area of Science:

• Ophthalmology
• Animal Models
• Myopia Research

Background:

• The link between near work and myopia is not fully understood.
• Previous research has not clearly established the association between near work activities and myopia development.
• A controlled animal model is needed to investigate the effects of viewing distance on myopia.

Purpose of the Study:

• To establish a model for near work myopia (NWM) induced by short viewing distances in guinea pigs.
• To evaluate the effect of viewing distance on myopia development.
• To investigate the impact of short viewing distances on ocular biometric parameters and choroidal blood perfusion.

Main Methods:

• Pigmented guinea pigs were randomly assigned to near work (NW), form-deprivation (FD), and hyperopic-defocus (HD) groups.
• NW groups were housed in cages with varying mean viewing distances (18 cm, 44 cm, 88 cm) for 14 days.
• Ocular biometric parameters (refraction, ACD, LT, VCD, AL) and choroidal characteristics (ChT, ChBP) were measured.

Main Results:

• The short viewing distance (18 cm) group showed a significant myopic shift compared to middle and long viewing distances.
• Vitreous chamber depth (VCD) and axial length (AL) increased in the short viewing distance group, correlating with the myopic shift.
• Reduced choroidal thickness (ChT) and choroidal blood perfusion (ChBP) were observed in the short viewing distance group.

Conclusions:

• Short viewing distance is a significant risk factor for myopia development.
• The study successfully modeled myopia induction through controlled short viewing distances in guinea pigs.
• Decreased choroidal blood perfusion and thickness are associated with myopia induced by short viewing distances.