Table 3. Mean central corneal thickness (CCT) and intraocular pressure (IOP) values obtained in previous studies, a literature analysis.
| Study | Age Group | Ethnicity/Race | CCT Value(s) (µm) | CCT Instrument(s) | IOP Value(s) (mm Hg) | IOP Instrument(s) |
| Haider et al. [9] | 7 months–18 years | African-American | 535±35 | Ultrasound pachymeter | 16±4 | Tono-Pen |
| White | 559±38 | 15±4 | ||||
| [17]Hussein et al. | 6 months–14 years | Caucasian | 551±48 | Ultrasound pachymeter | N/A | N/A |
| Hispanic | 550±34 | |||||
| African-American | 532±48 | |||||
| [20]Hikoya et al. | 8 months–18 years | Japanese | 36.9±544.3 | Ultrasound pachymeter | 13.9±2.4 | Tono-Pen |
| Muir et al. [24] | 5–17 years | Black | 537±36 | Ultrasound pachymeter | 19.3±6.0 | Goldmann applanation and Tono-Pen |
| White | 564±28 | 17.7±4.2 | ||||
| [26] Yildirim et al. | Mean 10.1±1.6 | Turkish | 564.92±32 | Ultrasound pachymeter | 16.7±2 | Noncontact tonometer |
| 17.9±2 | Tono-Pen | |||||
| Muir et al. [2] | 9 months–17 years | White | 562±35 | Ultrasound pachymeter | A/N | A/N |
| Black | 543±37 | |||||
| [27]Sahin et al. | 7–12 years | Turkish | 561.37±33 | Ultrasound pachymeter | 17.47±2.7 | Tono-Pen |
| 16.81±3.1 | Rebound tonometer | |||||
| Muller et al .[36] | 5 to 11 years | White | 529±36 | Ultrasound pachymeter | 15.4±2.4 | Non-contact tonometer |
| [29]Tong et al. | 9–11 years | Chinese | 546.0±31.8 | Non-contact optical pachymeter | A/N | A/N |
| Non-Chinese (Malay and Indian) | 536.6±31.5 | |||||
| Dai et al. [30] | 1–18 years | African-American | 523±40 | Ultrasound pachymeter | A/N | A/N |
| Caucasian | 563±36 | |||||
| Hispanic | 568±44 | |||||
| Osmera et al.[31] | 7–17 years | Czech | 554±33 | Ultrasound pachymeter | 14.5±2.6 | Goldman applanation tonometry |
| Herse et al. [32] | 5–20 years | New Zealand | 540±25 | Optical pachometry | N/A | N/A |
| Coste et al. [34] | 3 to 16 years | White European Caucasian + North African | 529.30±32.53 | Specular microscopy | N/A | N/A |
| Lee et al. [33] | 9–11 years | Chinese | N/A | N/A | 16.6±2.7 | Non-contact tonometry |
| Doughty et al. [35] | 5 to 15 years | White | ±529 34 | Ultrasound pachymeter and Specular microscopy | 16.8±2.9 | Non-contact tonometry |
| Lim et al. [37] | Mean 13.97±0.90 years | Singaporean(Chinese, Malays and Indians) | 578.76±34.47 | Ocular Response Analyzer | 15.12±2.84 | Ocular Response Analyzer |
N/A: Data not available.