humairah kamaruddin, naufal nordin, nurlin erlina abdul-manap, sumithira narayanasamy, sharanjeet-kaur & mohd izzuddin hairol.  (2022).  association between socioeconomic status and vision screening outcomes among preschool children in klang valley, malaysia: a cross-sectional study.  - the malaysian journal of medical sciences.  102-113. 

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, 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. 

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 theng yong, norlaili arif, sharanjeet kaur, mohd izzuddin hairol.  (2020).  double eyelid tape wear affects anterior ocular health among young adult women with single eyelids.  - international journal of environmental research and public health.  1-14. 

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. 

belina anne william m thomas , sharanjeet kaur , mohd izzuddin hairol , mahadir ahmad , lei hum wee.  (2018).  behavioural and emotional issues among primary school pupils with congenital colour vision deficiency in the federal territory of kuala lumpur, malaysia: a case-control study [version 1; referees: awa.  - f1000research.  1-11. 

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. 

woi pui juan, mohd izzuddin hairol, sharanjeet-kaur.  (2017).  monocular and binocular visual acuity changes with luminance-modulated and contrast-modulated letters in visually normal eyes throughout adulthood.  - medical journal of malaysia.  5. 

mohd izzuddin hairol, nabila syuhada roslan.  (2017).  comparison of visual acuity measured with different acuity tests for different age groups.  - medical journal of malaysia.  . 

pui juan woi, sharanjeet-kaur, sarah j waugh, mohd izzuddin hairol.  (2016).  visual acuity measured with luminance-modulated and contrast-modulated noise letter stimuli in young adults and adults above 50 years old.  - f1000research.  1-10. 

mohd izzuddin hairol, qazi mohamad omair, sharanjeet-kaur.  (2016).  effects of flanker type and position on foveal letter recognition.  - f1000research.  1-13. 

hairol, mohd izzuddin; abd-latif, nor azizah; low, patricia; lim, wei ping; aik, jean yee; kaur, sharanjeet-.  (2015).  effects of foveal and eccentric viewing on the resolution and contrast thresholds of individual letters..  - psychology & neuroscience.  183-192. 

sarah j waugh, monika f formankiewicz, m izzuddin hairol.  (2014).  effects of stimulus duration on foveal crowding using visual acuity letters.  - journal of vision.  787. 

mohd izzuddin hairol, norazizah abd latif, pui juan woi, nurul hafizah ahmad rashaidi, sharanjeet kaur, sarah j waugh.  (2014).  visual acuity and spatial interaction zones: investigating the periphery in anisometropic amblyopia.  - journal of vision.  772. 

hairol, m.i., formankiewicz, m.a., waugh, s.j..  (2013).  foveal visual acuity is worse and shows stronger contour interaction effects for contrast-modulated than luminance-modulated cs.  - visual neuroscience.  30(3):105-120. 

sarah j waugh, monika a formankiewicz, m izzuddin hairol.  (2012).  contour interaction extents (in mar) for differently-sized cs vary little within, but lots between, lm and cm acuity systems.  - journal of vision.  12(10):101.