mohd izzuddin hairol, mahadir ahmad, muhammad aminuddin muhammad zihni, nur fatin syazana saidon, naufal nordin, masne kadar.  (2023).  the impact of school closures during covid-19 lockdown on visual-motor integration and block design performance: a comparison of two cohorts of preschool children.  - children.  1-12. 

mariah asem, sumithira narayanasamy, mahadir ahmad, masne kadar, mohd izzuddin hairol.  (2023).  association between visual perception and socioeconomic status in malaysian preschool children: results from the test of visual perceptual skills-4.  - children.  1-11. 

mohd izzuddin hairol, yun rou lee.  (2022).  accuracy of vertical cup-to-disc ratio discrimination among clinical optometry trainees with different years of clinical experience.  - plos one.  1-11. 

mohd izzuddin hairol, shaari ahmad, sharanjeet kaur, lei hum wee, fauziah abdullah, and mahadir ahmad.  (2021).  incidence and predictors of postpartum depression among postpartum mothers in kuala lumpur, malaysia: a cross-sectional study.  - plos one.  1-12. 

mohd izzuddin hairol, naufal nordin, jacqueline png, sharanjeet-kaur, sumithira narayanasamy, manisah mohd-ali, mahadir ahmad & masne kadar.  (2021).  association between reduced visual-motor integration performance and socioeconomic factors among preschool children in malaysia: a cross-sectional study.  - plos one.  1-16. 

pui juan woi, joyce yi ling lu, mohd izzuddin hairol, wan nur amirah ibrahim.  (2024).  comparison of vergence mechanisms between university students with good and poor sleep quality.  - international journal of ophthalmology.  353-358. 

mohd izzuddin hairol, norlaili arif, pui theng yong, mariah asem shehadeh saleh ali, nik nor adlina nik idris, li ching ng.  (2021).  evaluation of the relationships between corneal parameters, ocular biometry, and myopia magnitude.  - sains malaysiana.  3077-3084. 

woi pui juan, sharanjeet kaur & mohd izzuddin hairol.  (2019).  binocular and monocular resolution thresholds throughout adulthood for luminance-modulated and contrast-modulated noise letters.  - sains malaysiana.  2185-2190. 

wan nur amirah ibrahim, zainora mohammed, norliza mohamad fadzil, sumithira narayanasamy, mohd izzuddin hairol.  (2018).  perubahan tahap pencahayaan dalam bilik darjah di sebuah sekolah pendidikan khas cacat penglihatan dan perbandingan tahap pencahayaan di bawah keadaan pencahayaan yang berbeza.  - sains malaysiana.  . 

mohd izzuddin hairol, norazizah abd latif, woi pui juan, nurul hafizah ahmad rashaidi, sharanjeet kaur.  (2017).  perbandingan zon interaksi ruang dua dimensi subjek normal dan ambliopia anisometropik.  - sains malaysiana.  1913-1921. 

pui juan woi, joyce yi ling lu, mohd izzuddin hairol, wan nur amirah ibrahim.  (2024).  comparison of vergence mechanisms between university students with good and poor sleep quality.  - international journal of ophthalmology.  353-358. 

nur amalina abdul khalid, bariah mohd ali, mohd norhafizun mohd saman, mohd izzuddin hairol, nur adibah yahaya, bashirah ishak.  (2023).  association between visual status of remaining eye, emotional well being and social functions in a sample of anophthalmic patients in malaysia - a pilot study.  - journal of sustainability science and management.  167-172. 

mohd izzuddin hairol, mahadir ahmad, muhammad aminuddin muhammad zihni, nur fatin syazana saidon, naufal nordin, masne kadar.  (2023).  the impact of school closures during covid-19 lockdown on visual-motor integration and block design performance: a comparison of two cohorts of preschool children.  - children.  1-12. 

mariah asem, sumithira narayanasamy, mahadir ahmad, masne kadar, mohd izzuddin hairol.  (2023).  association between visual perception and socioeconomic status in malaysian preschool children: results from the test of visual perceptual skills-4.  - children.  1-11. 

siti khadijah osman @ othman, thayanithi sandragasu, mohd izzuddin hairol.  (2023).  comparison of contrast sensitivity and central corneal thickness in primary open angle glaucoma suspects and visually normal participants.  - malaysian journal of medicine & health sciences.  112-118. 

mohd izzuddin bin hairol, sharanjeet kaur a/p malkeet singh, mahadir ahmad, wee lei hum, mohd norhafizun mohd saman, fauziah abdullah.  (2022).  pembangunan dan pemerkasaan wanita: kesejahteraan kesihatan, ekonomi dan sosial.  - .  8. 

mohd izzuddin bin hairol, sharanjeet kaur a/p malkeet singh, mahadir ahmad, wee lei hum, mohd norhafizun mohd saman, fauziah abdullah.  (2022).  pembangunan dan pemerkasaan wanita: kesejahteraan kesihatan, ekonomi dan sosial.  - .  8. 

mohd `izzuddin hairol, norhani mohidin, bariah mohd ali.  (2007).  warisan kecemerlangan optometri 25 tahun 1982-2007.  - .  56. 

mohd `izzuddin bin hairol;sharanjeet kaur a/p malkeet singh;masne binti kadar;manisah binti mohd ali;mahadir bin ahmad;sumithira a/p narayanasamy.  (2025).  development, feasibility, and effectiveness of a novel intervention program to improve visual-motor skills in young children.  - .  . 

yong pui theng, zainora mohammed, norliza mohamad fadzil, mohd harimi abd rahman, mohd izzuddin hairol, sumithira narayanasamy.  (2023).  visual comfort scores as a new metric to determine lighting needs of low vision schoolchildren.  - postgraduate colloquium 2023.  25. 

yong pui theng, zainora mohammed, norliza mohamad fadzil, mohd harimi abd rahman, mohd izzuddin hairol, sumithira narayanasamy.  (2023).  effect of illumination level on visual function of low vision schoolchildren at sekolah menengah pendidikan khas setapak.  - congress of optometry and vision research 2023.  13. 

zainora binti mohammed;manisah binti mohd ali;norliza bt. mohamad fadzil;mohd `izzuddin bin hairol;sumithira a/p narayanasamy.  (2023).  optimizing classroom lighting environment in fulfilling the visual needs of the visually impaired schoolchildren.  - .  . 

bariah mohd ali, mohd izzuddin hairol, bashirah ishak, nur adibah yahaya, mohd norhafizum mohd saman.  (2023).  meningkatkan kesejahteraan hidup pesakit anoftalmik dengan i prostetik ukm.  - .  1-11.