Administration of Nicotine Can Inhibit Myopic Growth in Animal Models

Area of Science:

• Ophthalmology
• Pharmacology
• Neuroscience

Background:

• Nicotinic receptor stimulation was previously observed to inhibit ocular growth.
• This study builds upon preliminary findings regarding atropine's mechanism and nicotinic receptors.

Purpose of the Study:

• To investigate the safety and efficacy of nicotinic stimulation in inhibiting ocular growth.
• To determine if nicotine can inhibit experimental myopia models.

Main Methods:

• Nicotine's effect on form-deprivation myopia (FDM) was tested via intravitreal injection and topical application in chicks.
• Nicotine's inhibition of lens-induced myopia (LIM) was assessed in chicks.
• Ocular safety parameters (pupillary reflex, IOP, corneal/lens/retinal health, electroretinogram) and non-ocular autonomic functions were evaluated.

Main Results:

• Nicotine significantly inhibited both FDM and LIM in chicks when administered via intravitreal injection or topical eye drops.
• Inhibition was observed but not in a dose-dependent manner.
• Most ocular health parameters remained unaffected, but the highest topical dose temporarily reduced cardiorespiratory output.

Conclusions:

• Nicotine demonstrates significant anti-myopic effects in experimental models.
• Despite efficacy, nicotine's known side effects and addictive properties make it unsuitable for clinical myopia treatment.