Table 4.

Country-specific Parameters.^{3, 23, 25, 29-30, 34-36}

Parameter	Reference #	Barbados	Ghana
Population Demographics
Population	35	279,912	22,409,572
Population age and gender pyramid	36
Mortality	34
Medical Costs
New patient, adult medical eye exam	U.S. CPT 92002, 23	$39.58	$37.06
New patient, comprehensive adult medical eye exam	U.S. CPT 92004, 23	$69.78	$65.00
Established patient, comprehensive adult medical eye exam	U.S. CPT 92012, 23	$41.18	$39.26
Eye exam and treatment	U.S. CPT 92014, 23	$56.96	$53.81
Gonioscopy	U.S. CPT 92020, 23	$14.07	$13.01
Automatic threshold perimetry	U.S. CPT 92083, 23	$55.79	$54.36
Annual cost of beta blockers	25	$8.36	$5.35
Annual cost of prostaglandin analogues	25	$126.48	$56.32
Annual cost of alpha-2 agonists	Calculated from U.S. AWP	$147.01	$110.05
Annual cost of topical carbonic inhibitors	25	$156.19	$156.19
Trabeculectomy	U.S. CPT 3x92014, 3x92020, 23	$503.56	$468.79
Trabecluoplasty	U.S. CPT 92014, 92083, 92285, 23	$176.03	$165.03
Utility and Disability Parameters
DALY, WHO blindness	3	0.60	0.60
DALY, WHO visual impairment	3	0.244	0.282
Productivity Parameters
GDP real growth rate	29	2.10%	1.90%
GDP per capita	29	$15,560	$2,240
Gini coefficient	30	0.39	–
Share of GDP of wealthiest 10%	29	–	0.30

AWP = average wholesale price, CPT = Current Procedural Terminology, DALY = disability-adjusted life year, GDP = gross domestic product, WHO = World Health Organization